Ok all, so it looks like I am getting a RODI for Christmas. My question is what RODIs would you guys suggest? I don't need anything big, I only have a 55 gallon that goes through about 4 or 5 gallons of evaporation a week. I would really like to stay below $150. So any suggestions? (Especially if said suggestions involve eBay, or what to stay away from.) My fish better be happy with their Christmas present!