Building A Gaming Pc For World Of Warcraft, Any Advice?

I wanted to build a gaming PC since all the new stuff grinds my system to a hault. The only game I currently play that I would prefer better preformance on is World of Warcraft. I'd like to wall the settings out on that and still get good frame rates and little lag and connection issues. Any hints beyond spending two grand on a video card? How about NIC card specs? What else would help my game? The more detailed the info the better.
PS- I'll Buy Propecia probably pick up a copy of Unreal Tournament III once I've got the system for it, so let's go for both.

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