Password Cracker - Enterprise Constraints

I work for a large Fortune 100 company that has recently invested a TON of money into beefing up its security function.  As such, I was brought on to be a lead member in the penetration testing team.  Amongst the many capabilities we are asked to have, password cracking is one.  Performing similar functions at other companies, we were given free rein to procure the pieces and parts necessary to build the ultimate cracking machine.  This new company does (as I’ve been told) ‘millions of dollars a year with HP’, and as such are requiring us to buy all of our hardware from them due to existing negotiations over support and pricing.  While this wasn’t ideal, I figured I could at the very least mix and match hardware from the enterprise and consumer lines to still build something solid enough.  In my most recent conversation, I was told that HP’s Enterprise and consumer lines are completely separate, and that all hardware must be from the enterprise offerings and be ordered to usable spec.  Once again, not the answer I wanted.  I need to get a proposal together very soon to build the best password cracker I can from the options provided, but these all being enterprise-grade cards I honestly have very little data from which to research. I am hoping the experts on these forums (yeah, I’m looking to guys like you epixoip for help) can help me put together the best rig from my options.  Then maybe, someday, I can convince the higher-ups to let me swap out these high-cost low performance cards for the much more logical low-cost, high performance consumer cards.  Here are my options and the number of cards the boxes can support (please refrain from negative commentary -- i know they are great cards if I were an actuary, haha).  I really appreciate everyone’s input!
 
NVIDIA Tesla K40 Workstation Coprocessor
NVIDIA Quadro M6000 12GB Graphics
AMD FirePro W7100 8GB Graphics
NVIDIA Quadro K6000 12GB Graphics
NVIDIA Quadro K5200 8GB Graphics
NVIDIA Quadro K4200 4GB Graphics
NVIDIA Quadro M5000 8GB Graphics
NVIDIA Quadro M4000 8GB Graphics
NVIDIA Quadro K2200 4GB Graphics
AMD FirePro W5100 4GB Graphics
AMD FirePro W2100 2GB Graphics
NVIDIA Quadro K620 2GB Graphics
NVIDIA Quadro K420 2GB Graphics
NVIDIA Quadro K420 1GB Graphics