Try the M before you decide, I was going for the 3.0 before i tried the M, it is really nice to drive on a daily basis. I also thought it would be too harsh, I am a girlie (albeit an old one) and come from a soft slk and TT and to be honest apart from it not liking potholes as much you would be surprised how pleasent it is to drive. The extra running costs are far outweighed by the fun. But it is your decision, if you where closer you could come and try mine. Also looked at old 911, but for the money the M won hands down, a lot of the cheaper 911s looked tired and having had an old porsche before 924 turbo years ago - it was like a money pit. Only way i would buy a porsche now is a could afford one a few years old. If i had £40k i would be driving a 911, love them.