>>2967363K5 if you are a cheap fuck, should still be able to get one new from japan.
K3 if you want a slightly better camera...and one that can select which focus point you can use on old lenses instead of just being locked at centre.
Disregard the "pfpfpffptptpfpt no lenses" dumbshits. They will always be this self-entitled and stupid. (and canikon will pretend to make them a new series of lenses every time they release a new 'model', thereby adding millions of dollars to costs in general becaseu of all the unpurchased lenses flooding the consumer moron market.
TL;DR: they aren't all manual lenses.
https://en.wikipedia.org/wiki/Pentax_K-mount#List_of_lenses_with_any_K-mount_variant