Pretty much the racing games, more specifically Project Gotham 2 and RalliSport Challenge 2. I had a GC and a PS2 (now have all 3), and it just seemed like I had seen all there was in terms of racing games. I really wanted some different games, plus ones that looked great. The only thing that was missing was the Xbox.
I'll admit, back in 2001, I wanted no part in the Xbox, because I thought it was another attempt on Microsoft's part to monopolize on another industry (but really, it's Sony who's doing that). As time went by, I started to want an Xbox more and more because it had it had a lot of exclusives I wanted to play, plus the games looked great. Finally in early 2004, I took about 12 games down to Satruday Matineee (a part of FYE), traded them in, got $151 in credit and used that towards an Xbox system, and it was one of the best decisions I made. I haven't stoped playing or buying games for the system since I've bought it.