http://heatsink-guide.com/content.php?content=peltierinfo.shtml <-- seems to be a quite thorough guide on peltiers. Though i cannot vouch for the accurancy of it...
The 226watt spec are what the Qmax is in the first graph btw.
(Alternative link: (http://heatsink-guide.com/peltierinfo.shtml) )
Yep... that IS a really good idea... and the best part is it works for any size array/data/number of drives too. (as long as you're building a larger or equally sized array)