I agree with everyone else, The Filter Guys all the way. I got the same unit you're looking at a few months back and couldn't be happier with it. It seems to be very high quality and has improved my tank noticeably (as RO/DI should). Those guys are really helpful on the phone and will help you figure out exactly what system best meets your needs and what add ons you do and don't need. My system was shipped super fast and was really easy to set up. No problems at all.
Here are a few pics of mine just for fun. I know I always like pics.(the whole thousand words saying)
Hope that helps,
Justin