Another thread which shows the real-world effect of SR:
If you will ever want any form of SR, the cheapest way to get it by far is to spend the extra money and buy the K100D. USD $100 or so for SR on every Pentax lens every made, and every Pentax-compatible lens ever made, is an incredible bargain. Look at prices for stablilized Canon and Nikon lenses... :shock:
You do have to pay the $100 up front, which can be a drag when you're excited about the camera and money is short. Good luck with whatever you decide.