Okay, first thing, use the spread sheet linked in my sig for fine tuning your gear setup. While it's not 100% accurate, it's supported by a large amount of testers over at EJ and is pretty much generally accepted as being the best rogue modeling tool available. Some basic rules of raiding and raid DPS as a rogue:
1) Paying full attention to what's going on and what you are doing is the biggest DPS increase you can get bar none.
2) Your DPS potential is not dependent on any one stat, rather it's dependent on the sum of all your DPS stats (hit, crit, ap).
3) All of your gear should be fully enchanted (helm glyph, ap on pants, agi on cape and boots, ap on bracers, ap or (even better) agi on gloves, etc... don't forget mongoose for weapons!
4) All of your gems should be raw DPS gems and have no stamina on them. There are two exceptions: 1) you need x blue gems for a meta gem to work, or 2) the item you are socketing has 1 blue socket and the set bonus is DPS oriented (EG: you can effectively pick up 6 stamina for free).
5) The marginal DPS gained from adding any pure DPS gem of the same quality is aproximately equal. Spread sheets generally give me less than 1 extra DPS on my buffed total when I swap a crit gem for a hit gem... this is on a predicted value of around 1500 total buffed dps. However, like many of us you will still want to maximize your DPS. In general, hit and agi will generally give you the best gains in a raid scenario with AP gems just behind, and crit rating gems taking up the rear. However, this is buffed DPS. Class buffs DO effect different builds and gear levels differently (so check out the spreadsheet yourself). Different stats scale better than others. Crit rating gems are generally the weakest choices for raiding. Crit scales well, but hit rating gems have a better rating to percentage conversion as it relates to overall damage. In general, they are better to stack until you reach cap (308 with 5/5 precision and WE on a raid boss level target).
6) You do not need 308 hit rating, 1700 ap, or 25% crit to do good damage. Always think about the "big picture" when choosing gear. Think about what you lose, and what you gain. If you are going to gain 10 hit rating, but lose 30 attack power, that's a stupid trade off. For quick reference, just use the itemization point system that blizzard put into place (as if you were comparing gems of equal quality). The DPS is approximately equivalent: 1agi = 2ap = 1 hit rating = 1 crit rating. This is not totally correct, but it's a good way to "eyeball" gear. I know that when using my unbuffed gear, AP gems would be favored... but since I don't generally roll without 24 of my closest buffing friends... I don't look at unbuffed DPS much... thus I choose hit based gems first for raiding... and since I'm now at cap I am generally using agi gems. I have a gem with crit/ap in my bracers which I use for PvP/PvE and I have purple gems in my belt to activate my meta gem... I have 1 ap gem which I am far too lazy to switch for agi in my pants... etc... In the end... the goal is to have a DPS gem in all your sockets of the highest quality that you can reasonable afford. If you play around with the spreadsheet you will realize that the actual difference in DPS gained/lost by swapping 10 crit gems for 10 hit gems in your gear is actually still pretty small... much smaller than most equipment upgrades.
7) Don't use druid leather. I am writing this just for you saturize! Your boots are awesome for feral druids... but they are not rogue boots! There are SEVERAL better blue boots that you can get from instances. Furthermore, both the fel leather boots (which are a BoE LW made item) and the masters treads (which are BoE and provide a level of extra stealth) will yield far better DPS than the epic you have equipt. Alternatively, the PvP honor boots are also a better choice. Since you are well into kara (based on your gear), definitely try your absolute best to make every Morose kill. His boots (the ones I'm wearing and I'm sure you are familiar with) will last you into T6 content. They are one of the best pieces you can get out of kara...