I just found this thread from a link you posted in your other build.
Honestly, I'd highly recommend doing one sump for both tanks. You'll only need one skimmer, pump and everything else. I'd do the cheapest glass tank you can find used or even the dollar per gallon thing if that's running. A 40 breeder would be ideal. Dry aragonite sand would be ideal for the displays and you won't need much, or any if you go bare bottom. I'd definitely go LED
on the lighting to save on power heat and your continual cost to cash from sales ratio.