Originally posted by jptreen with your needs as they are I would be happy to recommend a 2nd hand K100D Super (or an even earlier camera).
I find the K100D Super still gets some play even though I have my K-7 to hand - sure, it's the camera I give to others to shoot with and have it lying around in case anything interesting happens but it's got great IQ (as has my Optio E70L at ISO100! - IQ is not really an issue any more if you are prepared for other constraints...)
Bottom line - if it's landscape, interior and product photography and you take your time, 9 times out of 10 you can get away with 6Mpix.
If not then look at a 2nd hand K10D...
You don't need a new camera, you just need a good camera.
My K10D stays on my flash bracket and my backup K100DS stays in my hand, most of the time.
Yes it is my backup, but because it is so light, and if I am not doing a pro shoot, it is my leisure primary camera.
It rocks!
Talking bout redundancy!