kz900 rear tire

I recently bought a 1976 kz900 its a ratty old thing but has lots of potental. I need advice on a rear tire. I live in the upper midwest so i need something that will be usable from 50 deg to 100 deg. I bought this bike to ride so I will get cought in rain from time to time. Would like to go as wide as possable on stock rim.

Need all the help I can get

I'm running with Bridgestone Spitfires. The run well flat out, but I ride mostly freeways, so not many twisties.
I'm going to try the Dunlop Qualifiers next time. Other riders I've talked to say they're great.

I like my dunlop tires. I have had several of them on my bike, been a great tire. I had a goodyear on the back 1 time, wasnt bad, but didnt last as long as the dunlop.