I would like to add to jansenmd's post.
LS is effective at about 100k dps. I like to measure it by the skill HotA. If I can crit for at least 400k (No dmg increase rune), then LS of about 3% will be effective...for any skills I use. I say this because When I had 80k dps, it was enough (with 500% cdmg).
I agree that the first three upgrades should be Belt, Chest, and Helm. Specifically look for an IK belt with about 130 str or more. That way you won't have to worry when you drop LS from your main hand...because you need a new main hand. Your offhand is QUITE nice (only way it would be better is LS instead of LOH..and possibly str haha). You're going to want an Echoing Fury for 3 reasons: Weapon Master passive, faster attack than a sword, and higher min/max damage. The godly ones with str, cdmg, socket are about 1bil on an average day, but the one i have (161 str, 56 cdmg, 1150 dps) was only 6 mil buyout 2 weeks ago. I recommend getting one with a socket instead of cdmg though if you have a 70% emerald or better. When searching, look for average damage of 720. This will yield minimum damages of 540+ and maxes of 930+
And of course, you DEFNITELY need more str. Like jan said, double.
EDIT: Oh yeah, the reason I recommend Echoing Fury for attack speed increase is because it frees up your gearing options...such as str,AR,cc,cdmg...whatever you need. IAS takes up a lot of item point allocation on gear.
Edited by iBetrayou#1502 on 11/30/2012 11:01 AM PST