K-3II since it has the built in GPS. That could be handy (at least in theory) for taking photos of stuff in the air and getting a general placement? At least as long as you don't use a telephoto and take photos of stuff wayyyy out near the horizon hehe
That said you might be able to swing a K-3 and a new lens for around 1k due to the pricing deals on the original K-3 right now. Esp if you don't really need the GPS in the II.
---------- Post added 10-13-15 at 06:21 PM ----------
Pentax K-3 vs K10D - Our Analysis
Not an end all be all comparison.. but specs wise.. look at the 'Differences' section. It is a phenomenal difference.. as if you are going from Cessna to Learjet.