I'd do Atlantic City at the drop of a hat. Although I've been all around it, I've never been there.
I have no idea how much they'd welcome adult entertainment but Denver could be interesting as well.
Back in the day, there was a One BBSCON at Colorado Springs that just absolutely rocked, it was here:
http://www.broadmoor.com/
Great place for a small to mid sized show, tons of great scenic places to just chill, drink and network. Only drawback would be lack of titty bars and hookers would likely not go over well with a lot of would-be attendees. Then again, there are a lot of us who would consider that a desirable "filter".