I did buy a 90g today and in the shop it was on a table 32" high. I took it as fate that it was there for me to look at and test drive/reach into. It was a choice between the 75 and the 90. The thing that got me was that the 75's overflow was 3 to 4" from the corner. Gosh i hated that wasted space. The 90's overflow was flush into the corner. Although a deeper tank, I'm likely not doing heavy reef at all.
Won't be setting up for months, and even more the boss lady might make me take it back after we frame it out and build the wall next week. Need the money for the contractor. Still, this is exciting.
Thanks for all the input. BTW, I'm 6' and can reach the bottom of a 90g tank I've found. And if it matters, I wear a 35/36 shirt.
Heck, if nothing else, this was a good thread for relative comparisons for tank depth, stand height, and personal height.