I use a pump like this one ... much higher flow than the two already mentioned but I doubt it's required.

http://cgi.ebay.co.uk/WHALE-GP1002-1...item335da4ae7a

Just a covered bucket ... no heatsinks or radiators etc required as there's enough water for the heat to just radiate into the room via the bucket.

I've run it for several hours with this setup and the spindle was still cold.