Hello and welcome. I'm not exactly impartial as I have one for sale here on Pentax Forum's Photographer's Marketplace (shameless plug), but I believe the K-5 IIs is an excellent camera and I know it can be found for cheap online. A few pluses:
1. The image quality is excellent
2. It's fully weather-sealed, provided you're using it with weather sealed lenses
3. The file sizes are easily manageable for most computers and their software, plus the files don't eat up too much storage space (newer high megapixel cameras are less friendly in this regard)
4. It uses common & inexpensive SD/SDHC/SDXC cards
5. The menu system is very intuitive and easy to learn (as is the whole camera)
6. It's design and its ergonomics are wonderful (it's very easy to hold onto)
5. It extremely ruggedly built and bests direct competition from its various non-Pentax rivals in that regard by a wide margin, in my opinion
There are reviews for it and other Pentax DSLR cameras that can be found
here on the forum.
If you want to spend less there are other great alternatives out there. Same if you wish to spend more.
Good luck and happy camera shopping.