Corsair's new external water cooling kit, the Nautlius 500, gets high marks for decent performance at a low price. The folks over at sudhian.com compare the Nautlius 500 to Silverstone's NT03 and NT06 coolers, and for $149 it does a decent job.
"This time around Corsair is placing greater emphasis on simplicity and easy
installation. The new Nautilus 500 promises to be an easy to install system
that is universally compatible with all processors. Corsair also promises a
low price too. The big question is whether the Nautilus 500 can cool
processors adequately without making the install too complex."