Originally posted by fullmental Thanks to everyone for their input, just ordered the camera body now and looking for some used lenses as I'm typing this.
Good choice and congratulations! I've owned my K-30 for three years now, and I still see no compelling reason to upgrade. As others have said, the sensor is really amazing, and the camera is a joy to use. Here's a link to a recent post I made boasting about the low light performance, with some examples of ISO 3200 pictures I shot:
https://www.pentaxforums.com/forums/151-pentax-k-30-k-50/295448-k30-low-light...ml#post3254142
The Pentax 50mm 1.8 or Sigma 30mm 1.4 would probably be a good place to start for a low-cost prime. Or even the older Pentax 50mm FA 50mm 1.7 if you don't mind a lens that looks a bit dated in terms of styling, but is a good performer.
The 50mm 1.8 is only $106 shipped new on Amazon, making it a ridiculously good bargain. At that price, I might have to pick one up!
Originally posted by fullmental Only downside would be video, but I don't often take it anyway, plus my Note 4 does decent 4K that scales nicely to 1080p.
If you want nice video, you might consider picking up a used Sony RX100-II for a few hundred dollars. In addition to being one of the best pocketable cameras, it does an outstanding job with video. I had one that I used to supplement my K-30. In December I sold my RX100 and replaced it with the Panasonic LX100 for 4K, but that camera is much more expensive. For 1080p, it's hard to beat the RX100-II for price, quality, and convenience.