W8000, K5000, Titan or 290X

@ Morne,
The jump from K5000 to K6000 (or W8000 to W9000) is quite significant, and pushes the budget out of reach.
I have two major limitations:
1. Cost of approximate $10000/system
2. I have to get them from Lenovo as that’s where the company has the purchase/maintenance contract with. Yes, I know… It’s a huge handicap, but I’m stuck with corporate policies here.

@ cubiclegangster
I did think of going 780, but isn’t Titan Black a step above the 780…
Plus, I wonder if the workstation cards are really that more stable as compared to the desktop/gaming cards?