i want to buy whatever i need to make my games run better. i play anything from CS, UT2004 to Doom 3, HL2. most of the time, my systems runs decent on normal to higher settings. but sometimes, it is laggy or the gameplay is not "smooth". the weak point on my system is the video card? i'm looking at new video cards like the 6800. it seems to be popular on this site. will i see a great improvement in gaming with a card like this in my current system?? i dont' want to spend that kind of money and see little improvement ...