Sexy set up for sure. I played with the idea of doing the multiple GFCI setup (Possibly after talking with Bombertech actually), but I don't have the realestate to mount these boxes under my stand or anywhere permanently mounted to my rental house.... I opted for a big arse UPS with no GFCI to the wall, mounted away-ish from water, then in-line GFCI's to each energybar8 (two). I then have periphery split across the EB8's so if one goes down, at least a portion of the tank is still running. I also have monitoring set up so if any of the energybars reports 0.0 amps, it alerts me. Some of my stuff isn't HA (highly available) though, so one day when I have a big boy tank, I'll have dual return pumps.
Great post!