Hey, check this out: The Electronic Sports League has created a new SF4 Ladder for the US PC players: http://www.esl-america.net/us/sf4/news/93821/.
For people who dont know anything about the ESL: The Electronic Sports League is one of the biggest European leagues for professional computer gaming (700.000 registered members, 315.000 teams and 4.2 million matches).
Since the latest they also have a league fr US PC Players and now also a Street Fighter 4 Ladder. Here you can read the SF4 Ladder rules: http://www.esl-america.net/us/sf4/1on1/ladder/leagueinfo/
For people who come from europe they can join the europe ladder: http://www.esl.eu/eu/sf4/1on1/ladder/
I also play there!
So maybe you try this out.