I have worked extensively with thermo-electrics, also known as peltier
junctions, around 20 years ago. Unless the developers achieve the levels
of efficiency that they claim are "just around the corner", TEs would be
a marginal choice.
Using the Seebeck effect to generate electric current requires a cold
side, heat sinked, and this will add to your total cooling drag.
Operating temperature is limited to 150d C, special consideration for
mounting, temperature cycling, Delta T and so forth limit the utility in
our home-built environment.
Re-visit this technology in 3-5 years to see if these companies can
deliver on their claims for improvements in device efficiency. Perhaps
then it might be worth the $TIME$ to develope reliable applications. My
opinion only, your results may vary.
For a more informed look see:
http://www.ferrotec.com/technology/thermoelectric/thermalRef01.php

C. Smith