Right now im running on a p4 1.7ghz with 512 RAM, and i need a new video card which can get me through Half-life2, and some other recent games like Doom 3 and Deus Ex 2. i have about $300 Australian to spend (about $220 US) but the price isnt that important- i basically just need something that will work well with my current system without overkill. Problem is, i don't know shit about video cards so any advice would be much appreciated.