I demand rock solid stability personally. I have been going with:
avx linx 20 pass (use most/all ram); easiest to pass but finds bad oc fastest
then p95 6-8hr small fft; hard to pass
then p95 6-8hr blend; hardest to pass when playing with ram
then 3dmark01 extreme 2ish hr loop; watch your temps on gpu

After I passed all that I haven't had a single oddity or crash excepting one application freeze in SC2 which I attribute to solely SC2 or realtek audio drivers.

-sf