Show us some of your pictures, where you think the camera has let you down, and that demonstrate you need something better.
Something "more professional"? Really?
Lot's of professionals use k-3s, K-5s and their Nikon Brothers, D7100s and D7000s. Define "more professional." Like if you make more money with a camera than some guy does with a K-3, does that make it more professional?
OK, I'll stop now.
Quote: Hi, I decided to buy something new.
Oh, you just want to spend some money you have lying around? I get like that sometimes too. Try a Pentax 645z.
That and 2 or 3 lenses should take care of that itch no matter how much money you have.