Well I ended up buying a K100D w/the 18-55mm DA lens kit.
I just got it, so I haven't had a good chance to really get into it yet, but my first impressions are very good.
I hear what you guys are saying about the auto-focus issue. Only one of my old lenses is AF, and it's a Ricoh Rikenon 28-100. Hopefully it works without issue. I've heard that the old AF lenses work fine with the new Pentaxes.
For lenses, I now have:
-Pentax 50mm 1.2 (I think it could be 1.4)
-Pentax 135mm
-Rikenon 28-100 zoom AF
-Pentax DA 18-55mm AF
It's been a while, looking forward to really shooting again!