P7P55D is an early model. You should look for a newer motherboard style with USB3/SATA3 (which is the P7P55D-E)
The GTX 460 1GB is as fast as the 465 but uses less power, generates less heat, etc. The 465 was a very disappointing card, the 460 is pretty good.
You should get the newer intel i5 760 for about the same price.
Corsair is good ram, but generally overpriced. These Gskill Eco are faster and lower voltage for cheaper.http://www.newegg.com/Product/Product.aspx?Item=N82E16820231321
No one can tell you what GW2 is going to require for max settings. Ive been trying to get that from someone at the tradeshows with no luck. The 460 is a pretty strong card at 1920x1080, but not superb at it. Its really an upper-midrange card.
Without a good power supply, those parts are just a paperweight. You have to figure out your graphics card situation because that dictates how powerful of a PSU you need.
You have a top end CPU mixed with a mid-high graphic card. You could drop to an AMD Phenom IIx4 955/965 system and use the saving to get a 5850 graphics card for better gaming performance. If your plan is to maybe get a second 460 1GB card in a year (when they finally release GW2) then the i5 system is a great idea.