I think the sly has commercial UTHs I have used both I tend to use commercial more than most. I run a business from my home and by Canadian law in places of business electrical wiring MUST be UL approved and in the case of flexwatt it needs to be wired by an electrician. It makes flexwatt very expensive to use legally in my situation. Illegal use, negates my insurance and open the door on criminal negligence that can mean jail time.
Even ignoring this I would be likely to run commercial on a single enclosure or even a few enclosures. The better UTH run cooler and therefore safer than flexwatt does . Thermostats especially modern designs (herpstats, eco zone, and herpkeeper) are very safe but nothing is beyond failure. I prefer to assume that sooner or later T-stat and failsafe will fail and having a UTH that does not get over 100ºF eases my mind. (intilliheat, ultratherm, and a few others)
http://images49.fotki.com/v855/photo...31/0112-vi.jpgHosted on Fotki
This is one of my sly plastics.
http://www.slyplastics.com/en/index.html
Powerhouse look great too I personally do not own one but a friend does it is really well made.
http://powerhousedisplays.weebly.com/products.html
Buying enclosures again i would stick with 16 inch ones. The 12 inch tall given 4 inches around the doors make it very small opening (8 inches tall) it is hard to clean in such a small opening. I am a bit (ok a lot) of a spazz and clean very thoroughly I am also 6'4" and 235 pounds so it is hard to fit my arms in.