I much prefer axb5 over a5, so that's my vote if e4 isn't popular. Which I believe gives us three votes for axb5 (jjacob, Timelord2067, and myself), three votes for a5 (Taras, abacus, and ErisDiscordia), and one vote for e4 (gotmilk_). Greenlion voted for Rf2, but that is not a legal move.