Brihop, I'm no expert, and I cannot give you a name of the best bull to AI service your cows. But, I have owned brahman cows and Simm cows. About 2 months ago, I had to sell 5 of my best cows. My pastures are shot because of the lack of rain and heat. The 4 of the 5 could of have been registered as Simbra. I sold these particular cows because, we have more Bruanvieh and Charolaise cows. They were fantastic mothers, and could handle your heat. They weaned some of my biggest calves using a black SimAngus bull on them. Some of the cows were the result of a Brahman bull on Sim cows and some were from SimAngus(.75 sim x .25 ang) on Brahman cows. I really hated to part with them. I currently have 1 simbra cow left and 1 brahman cow left. Each have a calf from my Bruanvieh bull,and both are heifer calves. Both calves are keepers, provided the weather improves here. We weaned our first fall calves this spring from the Bruanvieh bull. From a visual perspective, they were the best set of heifers we have raised. I knew no one with bruanvieh but read and studied them. I have not been disappointed. I chose braunvieh for replacements. We bought the best bull we could afford, which was a full blood. The future will tell if it was a good move or not. Mexico, Central and South America use bruanvieh and brahman cattle with great success, I don't see why it would not work in Florida. I intend to post pictures, but have been scramblin to buy hay. Maybe I can get it done soon. AS a note, most brahman cows have few difficulties with calving from your proposed bull choices. Using a brahman bull on continental cows can be more of a challenge. Caustic has mentioned this, and I second that from experience.