From time to time, people ask about starting hands guidelines on this forum. Personally I never have had any iron-clad starting requirements, but have always been interested in other people's. I just finished Phil Gordon's "Little Green Book" of NL and at the end (to my suprise) there were a few charts for NL starting hands. I certainly don't play exactly like this, but I thought that it was a useful tool for thinking about my own requirements. Also, I think I'll play a session or two just using these guidelines (keeping opponent's tendencies in mind, of course...) and see how it feels.
Phil Gordon's charts
BTW, I highly recommend the book. It's probably the best NL book I've ever read. No kidding.