If you want a Porsche...buy a REAL Porsche. 911 is the way to go...your pocket says which one (996,997,991...NA or Turbo).
M3 is better than any 987 or 981. And I'm a Porsche freak! I have a Cayenne TT and a 911 SC...have had all 996s(including 996TTS) and a 997 4S all AMAZING driving machines...the Boxster is a really nice roadster but the cayman is useless if you don't track it VERY often(it makes sense only at the track!). IMHO!
'08 M3 E93 DCT - Individual Diopsidschwarz/Palladium -19" 220 Gunmetal - 12mm H&R spacers - H&R Swaybars - BMC filter - M Performance grills - ECU - Zimmerann Rotors/Brembo Sport Pads