What's your planned application? I've often considered getting a 2x10 instead of using a 3x10, but then a gig comes along with a crazy loud drummer or guitard and I have doubts that a 2x10 would cut it. The UL310 cabs are pretty compact little units - not a whole lot bigger than a 2x10. But if stage volume isn't a big issue then that opens up a few more avenues for you.
*EDIT* - another thought is going to a Epifani UL112. There's plenty of times where a single UL112, paired with a Markbass LMK head (which seems crazy loud for 500watts) is more than capable in handling a wide variety of gigs. So for a combo, maybe look at the new Genz Benz Shuttle 1x12 combo.