Originally posted by R.Miller Yes, I would agree. Which is why I indicated just a few. In fact I just picked up a K-5 so not to worried about it really, but I asked about the button issue before buying. The other models (K-5II, K-5IIs and K-3II) seem to have no issues reported at all, so if someone wanted to be extra cautious in spending money those may be better choices. Especially if there is no warranty available.
Understood
For the record, both my K-5 (owned since new, not long after release) and K-3 (same) have given me near-flawless service, and though my K-5 doesn't get much use these days, the K-3 is still very much in regular use. The only minor issues I've experienced in my years of ownership have been two or three lock-ups that required battery removal and a couple of mirror flops on the K-3. Pretty amazing reliability, really. I'd be happy to buy well looked after, low shutter count, used examples of either camera.
If the OP can find a good K-5IIs within budget, that would be an awesome choice. Better dynamic range than the K-3 / K-3II, and the lack of an AA filter allows that wonderful 16MP sensor to do its best work