there are folks around these parts that would state OC'd 480 is the best price/performance.
For WoW specificaly, and no other games, the 480 will do a bit better.
If you are going to play other games then they will be quite comparable, with the 7850 being able to OC quite a bit (not that the 480 can't, but it will just be even louder and harder on power). The 7850 is also going to be quieter, cooler and will use quite a bit less power. I'd personally still stick with the 7850, unless you're playing only WoW..
I'd give the edge to the 480 by a bit.
And probably 100w+
HD7850 is simply a more modern card with greater potential moving forward.
Keep in mind the GTX480 is around 2 years old at this point and it's a power hungry, loud hot card. Be prepared to deal with the thermals if you get one.
Yup, the 7850 is the card I'd pick if it were me, but you might be losing a few FPS (5-10 max) vs the 480 since those games are very nice to Nvidia's architecture.
may i KINDLY remind future posters:
I wanted to stay with Nvidia since I mainly play Blizzard games and I read Nvidia works best with them.
thank you, that is all.
In that case, there isn't even a question. The 480 IS the card to get. The only potential competition was on the AMD side.