I was looking at the York Modular one a couple of weeks back.
Power-wise I was thinking of Konstantlab, a couple of their bus boards first and see if I have enough power for a couple of extra power sockets / Modules then get their proper case power and sell the uZeus modules.
Enjoy your spare HP, don't rush to fill every last space, this is not like filling sticker books. Resist the urge to 'complete' your rack, its never complete so just relax.