RO/DI question

[FiberglassMonkey]

I am going to buy a ro/di unit from brs in the next week. I was wondering what should I get? I have an add on canister with the di holder. So do I just get a ro system and buy resin, or should I get a ro/di like the stage 4 and add another carbon/sediment filter. Or stage 5 and add another filter. I just want best bang for buck. I will need only 20g a week. and trying to stay around 150$ max. Only going brs for the gb im in, if theres another that would work with free shipping i can do that. If any other info is needed let me know. All input is welcome and appreciated.
Thanks in advance

Stephen

 

[melev]

If you own the DI section, just get the RO system. If you need more DI resin, you can order that at the same time.