Uhm... V SP is the vastly improved version of V. It fixes the balance, fixes virtually all of the bugs, introduces fatalities (I think), adds a few new characters and removes the wolf, and is overall a damn good game. V SP is to V what 3rd Strike is to 2nd Impact.
It's on GGPO and very playable. There's usually 4-5 dudes in the room at peak hours.