If light penetration wasn't an issue, I'd like to get a taller tank, that's both deeper and wider.

I used to do 20 gallon water changes on my current 210, but about three weeks ago I started doing four/five gallon changes a day. I make 30 gallons of salt water, and when I feed the fish I take off the ATO, turn on the salt water ATO, fill up a tall five gallon bucket full of tank water (I use this water to rinse my fish food), about ten minutes later I turn off the salt water ATO, turn on the Kalk ATO... and I'm done.

I couldn't imagine doing that with a small tank.

I'd like to add on to what Chris said. He's correct, but to be more correct, you have to have bookoo real estate in order to truly have a variety of coral stuff. If not, all you have is a variety of frags. When one colony takes up all of the space in a 29 BC, that's it, that's all you have. But if you get a bigger tank you can have a huge variety of zoa colonies, or several dozen varieties of SPS, or you can run a myriad of LPS and softies. But you need the space.

And you'll never have enough space. The little tanks, and there are a plethora of beautiful little ones running about, require a certain level of restraint that you won't find in the bigger tank boys (and gals). I've got a fairly small tank and I have picked up coral thinking that I would be able to find a place for it... only to find that I don't. I couldn't imagine trying to maintain a small tank.