Originally posted by drougge K-5 obviously. It's got both AF and AE-L buttons, top display, grip contacts and very likely superior build. I also suspect the ISO button on the K-30 will turn out crippled. (Maybe not displayed in the finder, maybe not even controllable with a wheel.) Probably quieter shutter too.
The ISO button will probably work the same as it does on the K-01. Give it a whack, then make the adjustment (displayed on the screen) using the back wheel. So not really crippled at all.
Separate AE and AF lock buttons seem a bit superfluous to me when you can hold AF with the shutter release button and lock AE with the other one.
Given the capabilities of the K-30, and the soon-to-be-announced high-level APS-C successor, I would get the former, or wait for the latter rather than buying a K-5 now.