Weapon Selection at 70Follow

If you don't know me I've posted a few times and am still learning alot about WoW, my rogue is my first char to 70.

That being said - still specced dagger/*** 41/20/0. I am going to hit 70 in a day or 2, and have Ced's Carver sitting in my bank (dropped) and the chance to get The Night Blade for 500g (normally goes for alot more). I plan on staying ***. for a bit, but eventually will respecc to hemo....then AR/Prep. What are your thoughts? I'm not hurting for cash...but 500g is still a hefty chunk.
Thanks,
-Mag