Well, I've tried out several... The Fury Within looks grand, but I am REALLY digging the Xyrax mod... it's under the D2MOD.com link "Stairway to Oblivion".
It is tough as FUCK, but every skill seems useful... Dymestl and I JUST finished the Den of fucking evil (after several hours) and we are level 8 hahaha... normally you burn through the Den in like 20 minutes, and level 3 or so.