i did just that 10 months ago
after more then 15 years of reefing with a standard 125 i started over
key points:
1) tank - 60x24x30 shape is everything
2) flow - gyre type flow pattern with placement of pumps designed into the reefscape
4) tank and sump- in basement, summer cooler, larger sumps plumbed together, more volume
5) scape - open yet has a large surface area done with caves, overhangs, and 6 - 12" all the way around front, back, and sides for flow
6) corals - choice pieces well placed with growth, shape, color, and aggresion all considered
7) ease - CA Reactor, kalk, bacteria and a good skimmer - kiss
8) nature over technology - cheato, cryptic, detritus settling areas all included in sump
9) display bb so no sand to maintain
10) fish - functional as well as nice looking combos
11 big skimmer, closed loop and all flow helping the cyclical movment
hmm what else ??? i know there is more but that would be where i started