Ah, the dilemma I'm sure we all face.
So I currently shoot with a Fujifilm S9000 most of the time. I've actually been pretty happy with my latest round of shots, but I'm wondering if improved image quality would make it worth upgrading. I've been using it to capture pictures of plants & wildlife while hiking, usually many hundred per day. Here are the specs of this camera:
1/1.6" CCD
10.7X zoom, 28-300mm, f2.8-5.6
Full manual modes
JPEG/RAW capable
Hot shoe
AA batteries
No image stabilization
230k pixel flip up screen
The first camera I'm thinking about is its successor, the Fujifilm HS20EXR. It should be an incredibly easy transition for me. The biggest gains would be image stabilization and the big zoom lens. The higher resolution screen might provide enough detail to know if it's actually focusing on the right thing. Other than image stabilization, I doubt this would increase my image quality due to its greater number of megapixels. Here are its specs:
1/1.6" CCD
30X zoom, 24-720 mm, f2.8-F5.6
Full manual modes
JPEG/RAW capable
Hot shoe
AA batteries
Image stabilization
460k pixel flip up screen
The other camera would be moving up to a DSLR, the Pentax K-r kit with 18-55 mm & 55-300 mm lenses. I would probably only carry the bigger lens while out hiking. Pentax has in-body image stabilization, which I really like for DSLR's, plus it also has AA batteries, which I also greatly love. The screen has even more pixels than the HS20EXR, enough that I could probably manually focus half decently with it. The bigger sensor should equate to higher quality images and lower shutter times. Being able to upgrade the lens later also presents an opportunity to increase image quality further. Here are its specs:
23.6 x 15.8 mm CMOS sensor
18-55 mm & 55-300 mm
Full manual modes
JPEG/RAW capable
Hot shoe
AA batteries
Image stabilization in-body
920k pixel fixed screen

