I will have about $1000 to spend on a new PC... help please!

[Canyarion]

This summer I'm going to make about $1000. I've almost decided that I'll buy a new PC with that money.

I will use that PC for school, internetting and games. Games that I wanna play are WarCraft 3, World of WarCraft and perhaps others like Half Life 2.

So what do you think I should buy? Some guy already convinced me to get an AMD instead of Intel. He said I would need a GeForce 4 or something (about $250). Perhaps I want a TFT screen, they rule.

What would you get, how would you get it and in what state (new/used)????
Thanks!