I'm a lover of the DSB so IMO, go with a 20 tall(DSB fine sugar sized grain 4-6" deep 20"x13" or so). You can go with a fine grain bagged aragonite and just add a couple of cups of live sand or a few small pieces of LR and the fuge will populate and grow to become fully "alive" of a period of time. Where do you plan to have the skimmer, if you chose to use one?
There's nowhere else I'ld rather be... unless, of course, you're buying