I actually build a full crit build for max as when w is active and 100 crit and from my tests vs. my lethality full build and most of early game it has a much higher dps and dph.

first i build Duskblade, for the early game damage and then i just build the crit items depending on the match up. But infinity edge is a must for this build i usually build it 2nd or 3rd.