I personally like the approach Owen Wilson's character played in "How Do You Know". I hadn't been forced into a chick-flick in years, but laughing at his character kept me going.
The arrogant and/or cocky asshole approach backfires more than guys even realize. You're going to selectively attract daddy issues and other wimminz that are seriously messed-up. Sure they are wild and fun for the evening, but do any of us really want some crazy bitch on our front yard screaming "I'm carrying your baby!!!" (when you know better) at 1:00 am while you are bringing a new girl home?
For guys who have a lot going on at the time, I think a weird combination of confidence, sincerity and indifference (I know those last two conflict a little) works best. For guys who are still building, it's best to be confident, fun, high-energy, funny, etc. etc.