I think it would be a triple garage - the Range Rover is huge but it would still be my town car. I don't do Minis, give me a VW Golf!
I went for a spin in an M5 last year, not mine unfortunately, but we had it up to 150mph on the A505 heading into Royston. Ridiculously irresponsible, but amazing at the same time! The sheer power of that thing is incredible.