i have a radeon 9550 256mb now. i turn up resolution high and detail high in the games i play which is every demo i can download. but my fav is probably counter strike(hopefully cs source soon) most of the time in the games, it pretty good, but sometimes it get laggy (not internet connection). i'm assuming this is the video card causing it?? if so, i want to upgrade to something that will make it very smooth always... i've got a 385 watt power supply, i'll spend up to $400 (canadian).. any suggestions??