if I was in the tournie I'd like to be playing a couple of these:
Capcom Vs SNK 2 EO (Xbox/PS2/GC)
Super Street Fighter II X Grand Master Challenge (Dreamcast)
Street Fighter 3 3rd Strike (Xbox/PS2)
Street Fighter Zero 3 Upper (Dreamcast)
King of Fighters Dream Match '99 (Dreamcast/PS2/PS1)
King of Fighters 2002 (Xbox/PS2)
Guilty Gear XX Reload (Xbox/PS2)
Only pick PS2 versions of 2D fighters if you're desperate, as they invariably have superior versions of the game on other systems