Maybe we need a new term to accurately portray the 30-55 gallon range of reefs.
I'm in a similar boat to Gryphon: I scooped up a 90 gallon saltwater set up because the price was right, but it's not drilled. Now I need to find some polarized sunglasses to see if it's tempered. I'm going to be following this thread, since I'm going to have many of the same questions and issues. I also found out I'm going to Costa Rica for 10 weeks, so I'm being forced to be patient and not do any impulse buying.
I've been watching for RO/DI units on craigslist, but usually people want a lot for their broken stuff.