Street Fighter Perfection
Street Fighter Alpha 3 MAX on the PSP is a slight upgrade to my previous favorite incarnation of the game on the good ol' PS1. That, in turn, had been my favorite Street Fighter game since I had initially played it.
By culminating all of the best stuff from previous incarnations of SFA3 and throwing in Ingrid for good measure, Capcom has made quite the definitive version. True, it doesn't have the extra -ISMs of the later release in the PS2 exclusive Alpha Anthology, but that version also didn't have the more interesting bells and whistles of the previous ones, such as the entertaining World Tour mode, and the portable exclusive Eagle, Yun, Maki, and Ingrid. I never used anything other than A-ISM anyway....
So until Capcom can release another, more definitive version of SFA3 that throws together everything in the PSP version, the extra -ISMs from Alpha Anthology, and shoves some more characters into it (and you know it's inevitable), this remains my most loved Street Fighter.