Both itemisations I showed in the videos cant change much, so I guess that is how much crit you can get overall in "bis" gear.

As for Blood DK DPS not casting Hysteria on himself, LUL. And no, you dont want more than 90% arp from gear.
Ah alright thnx and I use that hysteria as a bargaining chip to get into pugs because finding an NA guild that matches my time is not exactly easy.