Karen -- I've had very good luck with Tommy Toe, Black Plum, Gold Rush Currant, and Coyote in the past. Those have all made it on my list of "will grow again." I'm not sure if you're also on Houzz, but Katie (kchd) did some great tomato reviews a couple months ago. Like us, she also deals with the heat. Here's one of her postings:
As for my favorite tomatoes for the heat, here's a short list:
Eva Purple Ball
Green Zebra
Anna Russian
Stump of the World
JDs Special C Tex