i was looking a few types of chillers for ya ,,the cheaper one are about $100 less then some others ,,,, ,which in this case i would not try to save that ,since a chiller will last you for a long time .
there a few brand you can look at
aqualogic --great unit
tradewinds-great unit
cool works _ Ice prodes ,Not for you
current usa -LOW COST __ a 1/4th will cost you $580 plus shipping
1/3rd will cost you $619 plus shipping
pacific coast _LOW COST 1/4th will cost you $549 plus shipping
hope that help you out
Ronen