insulate the impellor housing....but not the motor...if you read around xtremesystems you'll find that the same guy who used a mag5 (fully insulated) with a chiller forgot (maybe didn't know any better) to the turn off the pump when the computer and chiller were off....the mag5 heated the fluid (likely flammable) to such high temps that the tubing and pump itself melted, along with insulation and anyway BAD idea.
edit: jeez rereading this i just realized what a dangerous hobby some people take this to...
what specs you looking for? dc or ac power?
DC pumps i say the laing D4/D5 would be good. the noryl impellor housing looks like it would withstand low temps. impellor itself seems as durable if not more than any other PC watercooling pump. AC power... iwaki, panworld they would all probably work, they all have for others
james,
insulating the entire pump would have the same effect as submersing it, as far as performance (temp) goes.
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