Trixta on here should be able to advise you towards the mx5 route, he's seen the good side and the bad of them.
With regards to options, there are plenty of non turbo s-bodies for sale now for feck all money cause noone wants na's.

For example. . .
http://cars.donedeal.ie/for-sale/cars/3228157
http://cars.donedeal.ie/for-sale/cars/3162671