I like MiX's case on how I'm not Garak. It's far too convoluted for me to have come up with, since I know my role and it's definitely not Garak. However, it's definitely a piece of Maquis-hunting, and almost definitely useful to town. I say "almost definitely" because I still think leaving scum as uncertain as possible about where town's PRs lie is the best course of action.
Since it's out there already, though, and since it has a bearing on scum-reading Ash, then for anyone still not following MiX's Space-isn't-Garak argument, the gist of it is that I can't be Maquis because of EFHW's claim, and everyone who isn't Maquis had a strong interest in keeping EFHW alive to get another night's-worth of Maquis-cop results. Garak did not protect EFHW, therefore Garak is probably Maquis. Since I can't be Maquis, I can't be Garak.
It seems like solid reasoning to me, though I'm a bit biased! Of course, it's possible Garak spent the bus-driving shot early on and EFHW got a result from someone other than me, but even in a Maquis!Space setting, it makes almost no sense to spend the shot that early and to spend it on me. And I emphasize that I'm actually town anyway, so there's virtually no risk of Garak having already used the shot for that.
The only ways I can see for Ash not to be Garak are:
1) MiX is Garak. Not so likely given all his Garak-hunting, but it's an outside chance.
2) Raerae is Garak. The one-shot misunderstanding would be a genius-level play, but probably also something she'd do a lot better than some of us.
3) WCD is Garak, her Maquis-buddy is actually Jadzia, and her claim a weird diversionary tactic.
4) Snow is Garak, and his Maquis-buddy is the real O'Brian. Given that his claim came out even earlier than WCD's this seems really unlikely.
I can see the logic in voting Snow here from MiX's point of view. The downside is that MiX is more or less assuming that Ash is Maquis!Garak to deduce that he (MiX) wants to vote Snow, all without testing that intermediate hypothesis. I think if we're sold on the Maquis!Garak idea at all, then the best course of action should be to flip Ash himself first, and then go after the other people that implicates second if we were right on the first hypothesis and still alive to tell the tale.