Welcome to the site, Ransch! Six megapixels is plenty if you've got good light, you expose right and you set up your files right. My first digital SLR was a 4-megapixel Canon EOS-1D. I had lots of stuff from that camera published in magazines. Newer cameras will outperform older ones but if yours is getting the job done, no need to throw your money away
Have you found our Pentax forum yet? We can always use a new Pentax shooter there: http://forums.photographyreview.com/...splay.php?f=57