RO/DI Unit Wanted

[mharmon]

I'm growing weary of making the trip to the LFS/HEB for RO/DI water. I'd like to buy a RO/DI unit to replace the Culligan water filter installed under the kitchen sink. I think a small unit would do - I use no more than 10 gallons a week for top off. I'd need a TDS meter also.

Any suggestions?