I bought mine from BulkReefSupply.....
http://www.bulkreefsupply.com/store/...us-system.html
I like the plus system personally because it literally has EVERYTHING you would need for the hookups. Copper pipe piercer, sink faucet attachment, gardenhose/spicket attachment, extra in line valve for cutting off water supply directly at the unit, etc. Send me a PM if you want to ask any specific questions and make sure to find out if your water is treated with chloramine to make sure if it is, you get the filter for that.