I've been too busy to play much since the store championship and was wondering what people think is the list to beat for Regionals? I've played scum, rebel, and imperial in the past. What's a competitive list right now?

Fortunately, there is not one best list. You should look at the Skirmish Forum:

Imperial Assault Skirmish

For example: Winning Regional Lists and New Jersey Regional report

Thanks! And I agree. It's good that there's not one list meta'ing the fun out of the game.

I've been having fun with the Wonder Twins and two eSabs (Gideon and Goldie of course) but haven't gotten a chance to play it against lots of solid competition. Most of the folks I get to play are learning the game.