My fav weather site had 28* last night for us, but I only had 33* at my house. I had 28* one night, Thur. I think.
I had tried Brandywine in the past with no results, in my hometown, then learned that it is not very heat tolerant, so I have not planted them again. I had good luck with Big Boy and Better Boy, but they were not as tasty as I would like to have, but far better than grocery store tomatos.
I think that I will get Brandywine and Cherokee Purple on your recommendation, if I can find them.
Have you been to Maas Garden center, in the area of the Space Center? We are wanting to go there and look around, maybe get our veggie plants. It sounds like a good place to get plants that grow well locally.
http://www.maasnursery.com/index.html
Here are 3 good sites for info. I have never ordered from these people but they do have good info...good descriptions of many heirlooms.
http://www.reimerseeds.com/tomato_711.aspx
http://tomatofest.com/heirloom_tomato_seed_home.html
http://www.heirloomtomatoplants.com/
Black Krim sounds like a good one. I found some plants at HEB in Austin so am trying them for the 1st time...