Alternative vote is Instant Runoff Voting, right? If so, then it's bad, for it fails the monotonicity criterion. That means that raising one's vote re a particular candidate doesn't necessarally do the obvious thing.

Personally, I favor Approval Voting, since it seems to be the simplest possible change to our voting system that would still produce large gains.

(Also, would be nice if we (the US, that is) could switch to algorithmic redistricting and completely get rid of the whole gerrymandering nonsense.)