Go wif the ATI X800 if you got the cash
As for the monitor, go for a 17-in CRT. CRT's are inheritely better suited for gaming and are cheaper. And since you only have $1k to spend, you'll prolly have to go with one anyway. For less than $200, you can get yourself a nice monitor, like the
Viewsonic G75F. You might want to look around to see what you like, but in my opinion, Viewsonic makes some of the best CRTs around.
As for speakers, I would personally get a pair of good headphones from Sennheiser like the highly rated
Sennheiser HD 515. They go for $150, which is a bit pricey, but they are truly the best out there. I personally feel that headphones deliver much more accurate results than any speaker system for games. I only use headphones to play games [namely CS], nothing else.
If you
insist on having speakers, then you should get the
Logitech Z-5500's. Problem is, the cost about $300. If you can't afford it, then you can go for a 2.1 system like the
Klipsch Promedias.