Well, I am very partial to the greys. Slate Grey is excellent. Also, Meteor Grey is the BEST Porsche color.
If you really wanted a great, classic paint scheme, you could go with the Gulf colors, or just Gulf blue. I think one of the best blues on a Porsche is Ossi. Ossi would look great on your car, with the bright trim.
The oranges and yellows scream "LOOK AT ME", but are very nice on the older cars. I don't know how nice they'd be on the newer cars. And if you have a tan/brown/cork interior, Irish Green would also look good.
The shape of these cars begs for a middle color paint, IMO. Which is why I think Ossi Blue is one of the best colors for a 911, with Slate Grey following a very close second.