I have the Heliocol panels installed. Prime reason for me was an install to a steep standing seam metal roof subject to storm winds; however, your conditions might favor some other brand/style install.

Anyway, a non-biased source of panel advice (size, placement, tested efficiency, etc.) can be found at the Florida Solar Energy Center website run by the Univ of Central Florida

http://www.fsec.ucf.edu/en/consumer/solar_hot_water/pools/index.htm

We went with Aquatherm. Works great and came with a lifetime transferable warranty against any leaks in the roof and a lifetime transferable warranty on the panels. Hope this helps...

Here is a link that might be useful: new solar install