Hands down, the Pentax DSLR's offer more bang for the buck than any other camera available. Period.
Check out either the K10D or the K100D-Super - I recommend the K10D. And, as a bonus, your Ricoh lenses will fit the Pentax DSLR's, how's that for bang for the buck? Just a little reminder, the Ricoh lenses sometimes have a small pin instead of ball for the AF confirm slot and can cause issues. It's best to remove the pin as it will not be needed on the Pentax DSLR - if it's the rounded ball type, leave it, it's fine. Oh and, every single lens you slap on either of those Pentax DSLR's, will have Image Stabilization. Try that with Canon or Nikon