RO/DI QUESTION

[cbrine]

So I've finally talked hubs into letting me get a RO/DI unit. I really do not want to have to plumb it into existing water lines since I want to be able to simply move it when we move the tanks into the basement once development is done.
Can anyone recommend a great RO/DI unit that won't break the bank? Hubby is not going to be thrilled if I drop $400-$500 for one.

Thoughts?? Thanks for all your help!