Loved my 60 cube. I used an MP40 and it was perfect for flow. The gyre is a solid choice too.
Stock stand can be very tight. I used a 20high as a sump but it hung out the back by an inch or so. I used glass cut at Lowes for baffles. Worked extremely well for me.
For lighting, I used a Kessil A360W and loved it. Probably better options now. For a return, I used an Eheim 1262. Again, it was perfect. I converted the 2 bottom holes in the overflow into a herbie and drilled a new cole in the overflow but on the back wall for the return. I used a Reef Octopus 110 skimmer. I was very fortunate with my equipment choices as all ended up working quite well.
As others suggested, go with an open rock work. I used a "bonsai tree" ceramic sculpture from aquatecture.com. At its peak I think I had 6 or 7 fish(including a tang :eek:) and all was peaceful and beautiful.