Newark electronics has a 5" - ish 240V fan that I can vouch for as being very nice in every way, and only a few $$ in cost.
http://www.newark.com/multicomp/mc19697 ... dp/70K8580
I paid $7; not sure why they are now $15...
They also have a slew of 120mm fan stuff to dress up a unit, like filters and fan guards for very low cost. I spent 2 hours making my own fan guards from stainless mesh, only to learn later their fan guard is 95 cents. Anyway, I like Newark, good place to place a bulk order for just about anything you'd need for a controller.
Enclosure: Bought a Chinese plastic box on eBay. A total and complete POS, thin, bad in every way. Went to Home Depot and found a great selection of thick PVC junction boxes that are perfect, very easy to work with, cut holes in.
I'm very interested in hearing how that digital eBay SCR device performs.