Check out airwaterice.com. I bought a unit from them a few years ago for reefkeeping and it still works great. You can get a high capacity unit there for what you pay for a 5gpd unit at Home Depot.
Thanks for that tip, man. I had been looking at the ones in the big box stores, but they don't include the DI step that the reefkeeper ones do that nets in near-0 ppm TDS. Never thought to look at what th reefkeepers use. I usually want to start with a blank slate on my water for many beers and have been in the market for a water system. After seeing the systems they have I am getting a killer system (Typhoon III) for the price of a RO-only system locally.
I like it because you can bypass the DI step for filtered drinking water, etc. This is important for the wife approval factor for bottled water, and making coffee. Then we can use the RO/DI water for brewing, ironing, humidifier for when the kid has a cold, etc.