Hi 99nasha, remember me?! http://www.pricegrabber.co.uk/search...=9800+pro&rd=1
Check out these beasts, you can get one for around £100. It'll outperform the 9600xt with ease. The other option is a nvidia 5900xt, given best budget buy by pcgamer. Don't worry too much about the ram, it's the clock speeds and general features that matter Doom and half life will run well on both.
New pc was ordered saturday, ill tell you when i get it...