I liked Vega's original SF2 (and I think CE was the same) versus his Super theme.
Really dig Cammy's (as well as a few Overclocked Remixes of them).
Ken's is excellent.
Honda's was always pretty boring.
I thought the older versions of Bison's theme, while much rougher, sounded more cool and menacing. The cape intro and CE's night time background were cool, too.