Given that there is a K-1, and I'm considering leaving it home on my next trip, I wouldn't buy anything. Even though I own a K-1 and it's avery nice camera, I'm not convinced I wouldn't be happier with a K-P instead of a K-1. So my answer would be a K-P. As pointed out in another thread, our most appreciated image for our craft show days was taken with a 12 MP point and shoot. My opinion would be that folks who think they have to have a full frame or 36 MP to accomplish their goals are somewhat delusional, infatuated with the value of their photography and conceited in thinking anyone even wants huge copies of their prints.
There are maybe 5 guys on the forum, who do work good enough to consider for large scale printing and two of them have already bypassed the K-1 for 645 gear. SO my second answer would be, if I didn't think the k-1 was overkill, or I wanted more overkill, I'd be looking for a good price on a second hand 645D to compliment my APS-c gear. Same as before the K-1 came out. There are still a lot of folks who will brag they have to have something better than APS-c. I can't find any photographic evidence to explain why they think that however. It's all about posturing and attitude as far as I can tell.
For those, I point out I'd prefer to have an 8x10 film camera, and that's about as big is it gets. Who wants one of those snivelling little 35mm cameras. Be a man, at least go 4x5 5x7 or 6x7.
A 35mm sensor? pffft... that's not a desirable camera, that's a camera you use because you can't do better.
I will never understand people getting all snobby about 35mm, which has never been top of the heap.