One Bolt+ or two Bolt 500GB

I am about to buy my first TiVo system. I have three TV's and am considering one Bolt+ and two minis OR maybe two Bolt 500 GB and one mini. The option for two Bolts is so me and my wife would have separate accounts to setup for recordings and such. The down side is a total of 1 TB instead of 3 TB. If two systems would we be able to share recordings over the moca network? Will the Bolt plus and two minis allow enough flexibility?

We currently have three DirecTV DVR's that are networked...

One Bolt+ or two Bolt 500GB

One Bolt+ or two Bolt 500GB