Flexwatt question

I am building my first rack this weekend and have some questions about flexwatt. The rack i am building will hold 32qt and 16qt tubs. What size flexwatt should I use. The 2" 3" and 4" seem too small but the 11" seems too big. Right now I just use individual UTH for mine so not sure how different flexwatt is. Also what else do I need for the flexwatt?

I went with the 4 inch 8 watt for mine. I have 32 quarts, 41 quarts, and i think 12 quarts. Its working fine for me.

Awesome. Now can I use one thermostat to control the whole rack or do I need a seperate thermostat her each shelf?

I went with the 4" Flexwatt for a small rack with both 15qt and 32qt (sideways) tubs, I watched a couple of vids where a fellow was using two strips of 3" to get more area, but with mine up and running the temps are right where I want them with one strip of 4" at the back. Here's a pic after the top shelf was wired and taped down
[IMG]http://i1204.photobucket.com/albums/...825_214644.jpg[/IMG]

Make sure to post pics when it's all done.:)