I've been using Bibble Lite for my K100D, and plan to soon be using it for my K10D. It is the perfect compromise between ease of use/quick learning and features/performance. It is also very fast, and has batch capabilities.
They offer a 2 week free trial, and you can probably get a 2 week extension if you request it (I did). The cost is $69.00. It is considerably more powerful than ACR (IMO), and if no editing is required, Bibble is generally all that I need for PP'ing. See:
Bibble Labs - Professional Photo Workflow Software
In terms of the question of K10D support, they issued the following statement on November 20:
"just as a heads up, there won't be an update untill next month....Holidays and all that."
Presuming that the "Holidays" were Thanksgiving, it should be able to handle K10D PEF's any day now.
One caveat: Its present version, 4.9, does not work with DNG's. It is rumored that the next major update, to 5.0, will.
Larry