I got the same system as Shane about 4 months ago and have been very pleased. I recommend getting the same model -or something similar - with the drinking kit. For one, it's really convenient for doing topoffs. It stores about 3 gallons of water in a pressurized cannister to use for the drinking water. When I need topoff water, it passes the stored water through the DI first, before it starts processing new water.
Bottom line, it takes me about 10-15 minutes to fill a 5g bucket, because the first 3g have been stored and come out right away. Otherwise, it would probably take 1.5 - 2 hours to fill my topoff bucket, which I have to do every other day.