Slightly off-topic, but another really important thing to consider when evaluating offers is the IP agreement: Make sure that you retain your rights to work that you do on your own time.

If you're not careful, you might inadvertently sign away all title to that cool little startup that you get going on the side. As a corollary, just because "everybody signs the same contract," it doesn't mean that yours can't be different -- but make sure it's changed before you sign.