Which entree level dslr?

I'm comparing the
Nikon d3200
Nikon d5100
Pentax k-30
Nikon d5200.
This will be my first slr camera, and I will be shooting outside for the most part. I'm looking for a camera with good picture quality. Wich drew me towards the niko d5200 and d3200 due to their 24mp. I also liked the swivel display the nikon d5100 and d5200 offer. Another thing I like about the d5200 would be the many focus points. But what really drew me towards th e k-30 was the weather proofing and the 6 fps. What camera should I choose? What would be good for a beginner looking for a camera that I can progress with as I get more advanced? Thanks for reading this! Ohh. And with camera takes the clearest photos? And if you have any other slr suggestions under $600 that would be great!

When buying a DSLR your buying into a system, Pentax is the cheapest system by far.

It has all the functions you will ever need to progress to Pro level, unlike entry level Nikon's, it can use any Pentax K mount lens, 100's on eBay or similar cheaply, but they really shine with Pentax L series primes. All will be image stabilised as it's built into the camera not the lens as Canon and Nikon do.

It has the Sony Exmore R sensor (like Nikon) so they are good at low noise in low light at high ISO, Canon sensors are 3 generations behind.

Lot's of Mp means you can print bigger, it also means finer resolution, but only at the cost of less dynamic range and more noise in low light. Interestingly Pentax didn't go with the newer 24Mp sensor because of this.