Sorry if I started something with my question. I do appreciate everyone's input though, and between this and searching through other threads I've been able to make my purchase. Thank you all for your help.
I ended up going with the Fleck 9000 SXT, 12x52" tanks, gravel bed and 2 ft^3 of standard mesh resin per tank. I will likely have 3-4 people living here in the next year or two, and it just made sense to me to go a bit bigger now. Honestly, even if I went with 1.5 ft^3 of resin it's still overkill for just one person, so if I'm already going bigger than I currently need I figured I might as well size it to where it would work for either a small-sized family *or* a large-sized family, since the house can easily support one.
If it weren't for sites like this, I probably would have just waltzed into Lowes or Sears and bought a brand name unit for not much less than what I paid for the system I ordered. Thanks to everyone who posts here, I'll be back if I have to look up answers for any installation or programming questions.