I would stick with a known brand so it doesn't crap out on you two weeks down the road and everyone knows how much of a PITA it is to try and return anything on eBay. BRS has a lot of good choices you can go with for a good price. To be honest, if you have the extra cash, I wouldn't get anything else then 150gpd or else you'll be waiting forever for your water and you'll be wasting a butt load of water.