I say Dirty if you can work your advertisment voodoo, and we get ppl really set on particpation. The rules should be easy. I think my old rules can still work. Even once we have intrest we can tweak them before the actuall tournament.
Thing is, I'm not much of a 1v1 player; I just don't find it to be all that interesting though I wouldn't mind watching other people playing 1v1's in spectator spots. To make this happen, someone needs to step up and try to organize it. Perhaps a 1v1 tournament (not an ongoing league, just a tourney that could take place over a single day or weekend) could be organized for starters.
If most people would prefer 2v2, then a 2v2 tourney could be organized. That might actually be easier in that 2v2 means having fewer teams to manage.
I would work these tourneys like this. Announce that there will be a tourney on a certain day or weekend and then invite people to sign up for it, perhaps the first eight teams of 2 players for 2v2. (That's it, tourney's closed, we have our 8 teams.) Then schedule them to play matches against one another. I guess it could be organized as a one-map elimination bracket.