Rack questions/help

My rack is finally built, I just have a few questions.

http://i51.tinypic.com/v966w.jpg

I'm going to be using belly heat, so I was wondering what size flexwatt I should use?? I was hoping that I could use one size for the whole rack, meaning one thermostat to control the temps of the whole rack.

There are 3 large tubs, and 6 small tubs. I really like the way it turned out!

Also what thermostat would you all recommend? So I can control the whole rack? I would need to plug quite a few things into it, I'm thinking 9 heat sources so what would work best?

I appreciate any and all advice :D

I'm a noob to rack building so use simple words.. hahah

Thanks everyone!

Anyone? :oops:

I have one similar to your setup and i use 4" flexwatt with no problems. I also use belly heat. I use the herpstat ND. Why will you nee 9 heat sources? You should only need six strips of flexwatt the length of each shelf, then you can just link them all together so that you will only need one plug. Hope this helps some.