The problem is that I would have two cars, my MX5 and a Tuscan. Finding an insurance company that allows you to apply your existing no claims bonus across both cars and quotes decent rates is the challenge.

Fair enough - I think the best you are going to get is an introductory 20% no claims on the second car - if you made the Mx5 the second car, then it shouldn't be too bad. I'm finding this year that I have to put both my cars through separate insurance companies (My other car is a Subaru P1, which is far worse for insurance)

Talk to some Tuscan owners, many, many of them are finding a set is only lasting 6,000 miles, effectively doubling the cost of every service.

I guess it's all down to whether you wheelspin in every gear, which, while undoubtedly fun, ain't going to help the tyres. I only know 2 Tuscan owners & they get more than 6,000 out of their tyres, although admittedly they have both needed new wheels for their cars after some exuberant kerbing at track-days.

That's not a problem, because I would still have my MX5 for days like that anyway...
Cool. Whatever works for you. I was just suggesting that with a year & half old car, the numbers came out slightly differently - one of my mates has bought last week a 1.5 year old Griffith 500 which he has on HP at £400 month (Includes 1 year warranty)

cheers
Craig