jet stars do great in the heat in my area. they are a good midseason tomato, but are not good for canning cause they are low in acid but you can do them just add more lemon juice. for eating, i like them. it takes them about 75 days from the size you got ther to picking tomatoes.
if i cant find any siberians or seeds this year i am definately going to put them in there next year. if i remember right, theyll handle temps in the 30's.