As I was looking at changing companies a couple years ago, I made a little company evaluation form to help me better weigh some of the most important factors. This is based on the Career Tools series, How to Choose a Company to Work For. It was really helpful for me again recently as I looked at a couple of opportunities that came up (they offered me a substantial raise, but when I weighed the other factors, I could see that it wouldn't be a good fit overall). I hope that this can be helpful for others in the community!
Because this is a public form that I've created in Google Docs, I'd recommend making a copy of it for you to keep private so that you don't have other people fiddling around with your numbers. Note that the factor weighting is how I have customized them, but the percentage weights can (and should) be changed for whatever your priorities are.