Yes it is illegal, and like 50 people got banned from the official DE UT forums for talking/posting about it. But hey, its their fault for all the early hype right? ;]
The 900mb version is the one you want, you will also need a trial crack and multiplayer patch for it. Look in #ut2003 on efnet for more info.
Fine for what guys?? Stop telling him that. Yes the card will work but why have a 2.4 behemoth and a game like Unreal to run on a card where you have to compromise performance. Upgrade your card to at least an ATI 8500LE or a GF4 4200 if your strapped for cash. Let your cpu be free and let the card to the work it was intended to.
Go here for great prices http://www.newegg.com/