ATi is a Canadian company founded in 1984 by three Hong Kong immigrants (KY Ho, Benny Lau, and Lee Lau). KY Ho is still the head honcho at ATi. If you're cheering nVidia because Jen-Hsun Huang is asian, then you should be cheering for ATi as well.
As for the original poster, the Ti4200 is more than enough for now. When I overclock my P4 1.6A to 2.13Ghz (I use an MSI 645 Ultra motherboard though) I score around 11,300 marks with the Radeon 9500 Pro clocked stock in 3DMark2001 and around 3550 in 3DMark2003, so you wouldn't see any dramatic performance differences.