I think you should wait. I don't live in the US and certainly I don't make as much as some people do over there so I have to wach my purchases. I understand the whole argument on SF being milked since the old arcade versons but I don't recall the newer AAA titles on that (Dead Rising, Resident Evil and Marvel vs Capcom).
In any case, my bad for not foreseeing this trend, and as you, perhaps a year should suffice until they release the complete version and then you can buy it. I don't want to go through this again so I'll wait until it's on the bargain side (-$25)
I believe Capcom won't wait a year for a 3rd release. I may really want to play this game, but I could wait 6 or less months. Even if there wasn't another new release by then, this second release would had drop it price.
If your a collector and Marvel fan(such as myself) then its no question as to buying the new version(and the old for that matter). If you really have to think about it then you probably shouldnt bother because you will find something else to complain about most likely.