[admranger]

If you want to trailer a car, get the Elise (assuming you fit into that go cart). Visceral car w/all sorts of potential in the right hands. They are just too damn small to drive anywhere with all your track crap, let alone no one can see you and they don't appear to be all the comfortable for long drives to tracks, etc.

E9xM3 can haul extra set of wheels/tires, jack, tools, etc., etc., etc. but rod bearings and throttle actuators. Comfortable, fast, hoon-able, tons of bolt on go-fast parts. Will eat consumables at a fair rate, but they aren't terrible $$$.

E46M3 -- No. Thermal management, vanos, rear subframe, etc. all suck - yes, it's fun to drive but the Cayman is just as much/more fun w/o all the issues.

Cayman is the most pure driver's car with any creature comforts (sorry Elise), but unless you get a GT4 they can be slow in today's HP world. Just drop the 3.6 in an S model (kits exist) and you can go fa$$$$t. They just don't haul a lot of stuff and I believe they are a bit harder to work on given the mid-engine layout. Consumables are a bitch, $-wise too.

So get an E9xM3 and have fun!