I would also recommend Turbo with a tiny caveat. People are more likely to "drive" a turbo a bit harder because its a ton of fun. That doesn't mean they will up the maintenance. Also, depending on where you live, the car can have various levels of rust issues. Mine was a very straight car until 2 years after I bought it when the demons popped out. If I had read a lot here, I would have been more prepared.
I have not driven a N/A Supra, so I can't comment on them, but I notice that there are more of them for sale that seem to be better maintained. Thats not necessarily a truth, but thats what I have noticed lately. Perhaps the people who upgrade and mod the heck out of them are slowly eating up all the turbo donor cars?
http://www.toyota-supra.info/forums/supra-faq/3296-buying-supra-what-to-know-first.html <--- This is a good little read.