The MaxCap is the Cadillac of all RO/DI systems and the ProPlus is a real bargain at $149 including the TDS meter and pressure gauge. With your systems you could even add a membrane doubler and get 180 GPD.
Are you in the City or elsewhere? One thing to consider is many systems have a high failure rate in NYC due to the sediment loading in their tap water, the TDS is very low but the turbidity and particulates are extremely high. Spectrapure offers prefilters designed just for that application and they have been in use for several years with great success, you might contact them and ask about them. Just an FYI.