[gregzz4]

Without knowing what size of larger tank you plan on getting into soon, it's hard to suggest a unit
For the most commonly used units, you can select from 50, 75 and 100GPD
Look for a unit that has a backflush valve as it may extend the life of the RO filter

Without knowing what your tapwater TDS is, it's hard to say whether or not you need the DI part of a unit
Here in Burnaby I get away with an RO unit without the DI filter
Our tapwater is sometimes as low as 6 TDS, so I don't even use our DI canister right now as the water out of our RO is always 0
I installed a couple extra valves, so I have the option of using our DI if our RO output ever rises

As far as drinking it goes;
I originally was drinking our RO water as it was so nice to not have the chlorine smell, but, after a few weeks, I grew tired of the bland taste of it

Drinking DI water, according to many studies, is a big no-no as it will strip your body of minerals so, if you plan on drinking your filtered water, T off of it before your DI filter

I've gone back to drinking tap water