I went the other route. I traded my Caymen S for the M. I am a huge Porsche fan and will probably pick one up again some day. But after owning both I think the M has more fun factor. The Porsche turned more heads though. The spyder would be a great car is Southern Cal. You can't go wrong either way if you ask me. Both are engineering marvels and fun to drive. Just don't be upset when M3's are looking at you in the rear view.
2008 E92 Interlagos Blue Metallic M3
fully loaded with fox red leather and carbon fiber interior