Actually, 6yr old RangeRover?
Hahahahah the best load of tosh he's come out with yet. A Range Rover out of warranty - good luck with that one...
I had an RS4 (a B7) and to be honest, for the running costs it didn't feel that quick. It also had the carbon build up issue which isn't a cheap fix and discs and pads (which you will get through at a rate of knots) are mega money. 4 tyres = £1600. Cheap it isn't
I had a test drive in a V8 M3 recently which was lovely but as you've mentioned not liking BMW's that rules it out.
Also had a Cayman and handling wise it was fantastic, just felt a bit under-powered. Mine was an S - looked nice, handled well, not that quick. And it liked a drop of oil too...
Me personally I'd have another Nissan 350/370z. They can't give them away at the moment and there's some really good deals about. Or get an R35 (and remortgage for running costs).
You really will be hard pushed to beat a Golf though. Brother has an R32 which whilst not mega quick on paper, makes a lovely noise, has loads of kit, will take two bikes easily and isn't that bad on running costs.