There's limited selection in the 19" size.
I think alot of people recommend the Avon AM 26 or AM20 series for best grip, but they lack vintage appearance, and don't last as long because they're softer for grip.
Dunlop K70 are quite popuar for all around use. Cheng Shin makes a cheaper copy that have gotten good reviews from some people.
And the stock Avon Speedmasters are not bad either. They last so long that they are normally hardened up before they wear out, and they don't handle well when hard. But, new ones work pretty good. And they do look vintage.
Dunlop K81 TT100 tires are a possibility, but the 19" rear version that's available is a 4.10, and it sometimes causes rubbing on the swingarm. Some people have successfully fitted them though, and I think it's a matter of whether your particular swing arm will have the clearance width needed. It's close.