I've been contemplating similar stuff, as the air is starting to get mighty chilly in Canberra overnight. (This is my first year of brewing, so I've still got a lot to learn.)
I've ordered myself an STC-1000, should be here any day, but while that's all well and good for keeping the fermenter warmed (haven't decided whether to use a pad or a belt yet, leaning towards the cheapie reptile pad), what about keeping the brew warm once it's bottled? (am I right in thinking it should be kept at roughly ferment temps for a couple weeks after bottling?)
The posters in this thread pointed me in the direction of reptile heaters, and I found this on ebay:
http://www.ebay.com.au/itm/Reptile-100-Wat...#ht_5574wt_1078
... would something like this, mounted in a cupboard, work OK? Would I still need a temp controller and sensor in there, or just put the thing on a timer? I'll probably just end up getting another stc-1000, at $25 bucks delivered from that ebay guy, you can hardly go wrong I suppose.