Yes, you should definitely try to shoot different things! What camera do you have now?
BTW, I no longer own the Pentax. I moved to full frame Nikon.
Awesome. I went with the Canon 7D. I was going to go full frame and get a 5D MK II but it's auto focus was awful in comparison to the 7D. For sports/action which is what I mainly like shooting, the 7D destroys it, and it's cheaper but a few hundred so it made it an easy decision for me.