I'm growing Inga uruguayensis right now, which is (reportedly) one of the hardiest species of Inga. It's too small to fruit, but maybe next year (if I'm lucky)?
I've been growing a few others -- Inga edulis, Inga feuilleei, Inga spectabilis, and a couple of mystery Ingas. I haven't figured out anything about their growth except that Inga spectabilis seems to not grow for me except during the warmest summer months whereas a couple of the mystery trees seem to grow a bit better.