If "SR" means image stabilization / vibration reduction / optical stabilization and you only wanted 1 or 2 lenses anyway, then why not look at the other DSLRs and get lens-based stabilization. The Nikon 18-200 VR is selling like hot-cakes for its combination of vibration reduction, great all-in-one range, and good optics (given the range). the Nikon D50 takes SD cards. The Canon 17-85 IS lens is also a versatile lens with image stabilization.
As for "proprietary" batteries... there are loads of $10 3rd-party batteries that work flawlessly. That goes for all the DSLR brands, be it Nikon, Canon, Olympus, or whoever. The proprietary battery systems tend to be able to pack more energy into a given weight & size, so work out better in the long run. That said, the recent Canon vertical grips can accept 1 or 2 proprietary batteries or a whopping 6 AA batteries. (I think the other brands have that feature as well.)
As for DSLR cameras breaking.... I think they are more durable than the single-lens options. I have 3 years and 20k photos on a Canon 10D without any problem. I definitely don't go out of my way to baby my camera. I have shot in rain, snow, and hail. I don't have a special bag; it just gets thrown in the backpack along with food, water, and other camping supplies.
Pentax is fine too, I'm just saying that other brands have other options that might be appealing.