$1,500 should be plenty for putting together a high end gaming rig. You have two main options at the moment if you go with intel. The new, latest and greatest top of the line Socket 2011 processors are now available, which said processors currently start at $600, or there is the tried and true socket 1366 processors, which are cheaper. There are also the socket 1155, etc processors, but for a gaming rig, you want the extra ram slots. I'll put together two options for you, one for Socket 1366, and one for socket 2011. I tend to use newegg for these lists just because they have decent prices and easy to link URL's, but you may very well be able to find some of these components cheaper.
Socket 2011 build:
Motherboard: Asus P9X79 Socket 2011 motherboard with 8 ram slots, USB 3.0 ports, Sata 6GB / sec controller and 3 way SLI / quad crossfire $329
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131800
Processor: Intel i7 3930k Socket 2011 hexacore with hyperthreading 3.2 GHz processor (essentially 12 cores) $599
http://www.newegg.com/Product/Product.aspx?Item=N82E16819116492
Processor fan: (REQUIRED - intel doesn't ship fans with their socket 2011 processors, which is lame!) Zalman, $99
http://www.newegg.com/Product/Product.aspx?Item=N82E16835118097
Case: Cooler master CM 690 II $79 with rebate
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119216
Power supply: Antec 900 watt $129 (that will give you enough juice to run 2 video cards in SLI, you may want to consider stepping up to an enermax 1,000+ watt PSU if you have any desire to ever run 3 or more video cards)
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371050
Ram: Corsair 4GB DDR3 1600 sticks, 2x at $24 each, $48, plus that leaves you with 6 empty ram slots for future upgrade
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145346
Blue ray Burner: LG SATA Blue ray burner $79 (you will need to also purchase software later to watch movies or burn blue ray, this is just the hardware)
http://www.newegg.com/Product/Product.aspx?Item=N82E16827136239
Hard drive: Western digital 500GB 7200 rpm $129 And yes, hard drive prices have gone through the roof at the moment. A decent sized SSD will cost you $300, you may also want to pick up 2 1-2TB drives and run them as a secondary backup data drive in a raid 1 mirror array (if one drive fails, the other drive has all the data on it, a little slower than just one drive, but redundancy is good for backups)
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136795
So thats $1456 without the video card or the Operating system. A new OEM copy of windows 7 runs $100 if you need it. A good mid-upper end video card is going to start at $199 for a Nvidia 560 GTX, which would put you at about $1650 The CPU just eats all the budget there.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130661
A Socket 1366 build gives us a bit more room to play with other components.
Socket 1366 build:
Motherboard: Asus P6X-58 E Pro (same motherboard I am presently running) Socket 1366, USB 3.0, Sata 6.0 GB / sec, 3 way SLI, quad crossfire, 6 DDR3 ram slots $224
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131755
Processor: Intel i7-960 3.2 GHz quad core with hyperthreading (essentially 8 CPU cores, comes with the fan) $289
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115224
Processor fan: None required, comes with an adequate stock fan.
Case: Cooler master CM 690 II $79 with rebate
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119216
Power supply: Antec 900 watt $129 (that will give you enough juice to run 2 video cards in SLI, you may want to consider stepping up to an enermax 1,000+ watt PSU if you have any desire to ever run 3 or more video cards)
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371050
Ram: Corsair 4GB DDR3 1600 sticks, 4x at $24 each, $96, plus that leaves you with 2 empty ram slots for future upgrade
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145346
Blue ray Burner: LG SATA Blue ray burner $79 (you will need to also purchase software later to watch movies or burn blue ray, this is just the hardware)
http://www.newegg.com/Product/Product.aspx?Item=N82E16827136239
Hard drive: Crucial 6GB / sec SSD $179
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148442
Secondary data drive array: 2x western digital 7200 rpm 1TB drives $139 ea, $280 total
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136767
Thats $1355 with the secondary drive array and no video card, With a SSD you will definitly need the space. Could go with a single data drive, but then you have the whole drive failure risk thing. A Solid State drive is definitly worth it, i'm running a 256GB one in my machine right now, nothing but good things to say about it.
Video cards, you could go with that 560 GTX for $200 and put you right at $1555, or more than one of them. The next step up would be a 580 GTX. They start at $500. You could also drop two of the ram sticks for now and add them in later as budget permits.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130587
The case I have listed there is about the best all around inexpensive large case with drive rails and toolless construction. Its a good case, and usually less expensive than others in its class. That being said, your case is the one piece of your computer you will have longer than anything else, so it does make sense to get a good one that you like, even if it costs a bit more. You may also want to take a look at some of the other cases out there, such as the Haf X, or the Thermaltake Speedo advanced, or some of the Antec cases and see what you like. Performance-pcs.com is also a good place to take a look at what is out there for cases
That SSD would also work well in the socket 2011 build, I just couldn't fit it in the budget there. If you do go with that build, you'll want to get at least all 4 ram channels populated eventually, as it will be a slight performance bottleneck. Then again with that much horsepower to begin with, thats like saying a bicycle parked on the side of a 16 lane highway causes a slight bottleneck...
Hope that helps!