Buying a RO/Di unit - Help

[Fragzilla]

I am looking into purchasing a RO/DI unit and I am looking for some suggestions on what I should get.

I would like to purchase it in Calgary but also would be willing to order it online.

I have done some reading on this site and have my thoughts what to get.

Whate do you people out sthere suggest to get and where I should get it
from?

I would like the best bang for my buck.

Thanks

Jeff