Those bcs setups look pretty cool, and w just 120v RIMS might be the way to go. I'm very happy with my herms setup- keggle hlt has 3/8in coil in it and 5500w element controlled by ssr/pid with a march pump to push everything around.
Mash tun temp is maintained/raised by changing hlt temp while recirculating through herms coil.
BK is just on a propane blichmann burner as I figure I don't need any automation/temp control to boil.
That's how I do it, but there are much much more sophisticated options on here. If you do go 220, then all electric is pretty slick. Check out Kals all electric brewery for inspiration- PJ has also diagrammed out just about every possible configuration just run searches to your heart's delight. Luck.