We'll be here to help when you figure out a little more about what you need.
For the full functionality of your Pentax SLR, you'd need to get a digital SLR. The Pentax digital SLR is nice - I've used it. YOu can read my Pentax *ist D review/test for here >>
The compromise is to get a high-end compact digital camera that allows you to use conversion lenses. Check reviews for 4-5 megapixel and above digital cameras. Some examples are the Canon G5, Olympus C-5060, Olympus C-8080, NIkon Coolpix 5700,l etc.