I own a 90 turbo with targa and all the other goodies, I know lot of guys here have thier lil special deals and love the hardtops or the NA for some ungodly reason but IMH it's not a supra if it's not turbocharged with a targa or at least the sunroof like some 92's sport, haha.
I take mine off all summer, if it rains I don't drive it stays in garage. In the spring and fall it's off as long as it's not below about 55, haha I man up and wear hoody. I've gotten ancy after winter months of not being able to remove it so on rare times its 45 or 5o in jan here I have had it off before and bundled up, LOL it was so worth it.
IN THE END:
Buy one with a turbo engine (7MGTE, 1JZGTE or 2JZGTE) and a Targa Top or flat out don't buy one!!!! IMHO