i think most probably just follow ufc. i try to catch pride when i can, but it's access on cable is pretty slim so it is hard to stay current...other than just the big names.
ifl has some decent showings but i hear they are not doing well financially...perhaps that was a while back and they're okay now.
shoxc has potential being on Showtime, but their roster is average at best...except for Carano

differnt note -- i was a bjj guy a couple of years ago as well...fun stuff and it is aggravating to hear fans boo 15 seconds after any fight goes to the mat.