I would go with the bigger shower caddies. Pretty much my entire second level consists of two corner caddies as shell shops, exactly like the bed bath and beyond one, and then two more that look like this
http://www.amazon.com/InterDesign-Sucti ... dy+suction for my moss pit and leaf pit. They practically give me 50% more usable space in my tank.
I actually don't use UTHs (yet). I have a 150 W ceramic heat emitter that I have barely perched on the tank rim with a clamp lamp. I hope to switch to UTH around Christmas. It heats my 90 gallon just fine, with about 85 on one side, 80 in the middle, and 75-80 on the opposite side. I like to offer them a nice heat gradient.
I would start looking at interdesign power suction hooks. I just got them, and they're the only suction cups I've seen to stay up for a decent amount of time.
When you've been crabbing for so long, you don't even know how many crabs you have now...