I'm looking at the following hardware for a new comp and I wanted to make sure there are no gotchas.

AMD Phenom II x 6 1090T Black Edition Six-Core CPU
8 GB DDR3-1600 A-Data Gaming Series Ram
NVIDIA GeForce GTX-470 1.2GB - EVGA Superclocked
Gigabyte GA-870-UD3 MB
800 Watt Power Supply
750 GB HD
80 GB SDD

I've read a lot of the post here, the reason I added a SSD . I'm not computer savvy in the least and any advice is appreciated. I'm particularly curious about the dual video cards and if that is really necessary to run 5 WOW instances on the same comp?