I use a Little Mark II with a Schroeder 1212r. More than enough power for live use, I played a large sized venue last night using borrowed bass bins (which were not up to scratch at all) and the rig did all the work and never complained. I think i paid £397 for the head and £360 for the cab second hand.
The Schroeder has an angled 12" speaker that, if you stand the cab on it's end, fires straight up at you while the other one points forwards.
Bear in mind that you can't predict what will happen in a live situation, if one of the bass bins blows or part of the PA goes down you might have to depend more on your backline than you first planned. It's happened to me more than once and i was glad i had 500w behind me instead of 250w.
Alternatively you could mosey on down to sunny Blackpool and buy my Hartke stack..............
I'd be wary of the Kickback combos as they're made in China now and have some quality control issues. My housemate has the 15" USA one though and it's excellent, clear and punchy but also sounds huge