Thanks for the info - I ended up getting a really good deal on a K-S2 from B&H - I don't know if I can post the price here, but it was very reasonable and included the new 18-50 kit lens and the flash. I don't actually need either of those, so I'll probably sell them and recoup some of my money. :-) Considering I can now sell the K-30 as well, this will be a pretty inexpensive camera upgrade. I also sprung for the O-GPS1... don't tell the Mrs.! I'm really dying to try the Astrotracer functionality. We're going down to Cape Cod this weekend and I know of a few good places that are at least reasonably dark and afford a view of the Milky Way to the South. Looks like the weather should be clear and the moon won't be rising until a few hours after the sun sets, so hopefully conditions will be perfect. I already have something to compare it to. The picture below was taken with my K-01 (same sensor as the K-30), with no Astrotracer:
Harwich Jetty
It took quite a bit of tweaking to get the image this far. Light pollution in the area certainly doesn't help. It will be interesting to see what the K-S2 and O-GPS1 can do with this same subject.
The Cape should be a good dry run for our big trip to Europe. Caliscouser, here's what's in my lens stable at the moment:
Sigma 17-50mm F2.8 EX DC OS HSM (Great lens, but a bit heavy, so I'm not really looking forward to lugging it around!)
Pentax-D FA 50mm F2.8 Macro
Pentax-DA L 50-200mm F4-5.6 ED
Pentax-DA 35mm F2.4 AL
Samyang 14mm F2.8 ED AS IF UMC
I guess I'd have to include the new 18-50 kit lens too, since it is going to be coming to me soon with the new K-S2. Technically, I could take all of these... but I'm aware of the need to pack light. If I were smart, I'd probably leave the Sigma at home in favor of the much smaller and much lighter kit lens. But the Siggy is a really great piece of glass and I'd hate to leave it behind. I could also leave the Samyang behind, but that's just such a fun lens that I'll probably end up taking it anyway. So that leaves the D-FA 50 and the DA 35. Technically I've got that focal range covered... but they are the two smallest lenses I have! And most of my filters are 49mm. Decisions, decisions!
Thanks again for all the info and opinions everyone!