PAC Coast CL-870 Aquarium Chiller $200. Runs well, I used it on my 180 gallon tank with metal halides, and it kept up. The chiller is cleaned, and ready to go. The power rating is 1/3HP. here is a link to a website with more detail.
http://www.suburbanreef.com/cl850-1-3-hp-chiller.html
http://www.suburbanreef.com/cl850-1-3-hp-chiller.html