I switched from WD to barb recently, didn't like the WW spec but LOVE the throwing Barb. (spec below)
http://us.battle.net/d3/en/calculato...kRP!fZY!ZYbcYb
With your 2.5 Mil buy two things to start:
1) Immortal King's Tribal Binding (With -5 Fury Weapon Throw & 3.00% Life Steal). Don't skimp on those two stats
2) Skorn (300+STR, Socket and 190%+ crit damage). This will cost about a mil.
Any money left over dump into gear with crit (ammy, ring, helm). Your crit should easily be 50+ with cheap gear, work on your crit damage 2nd. With Into The Fray and -5 weapon throw, your fury will basically be maxed at all times while fighting. This makes it easy, and allows you to spam marathan to juke/jive/dodge and sprint to the next pack of mobs.
Rotation is simple: Keep War Cry and Battle Rage up at all trimes. Harpoon when 3+ mobs then spam Throw w/ Ricochette until everything is dead. Pop Wrath (Slaughter) when you see an elite pack, they won't last longer than 3 seconds.
Currently I am running 195k DPS, 55% crit before I pop wrath, I sprint through everything very easy MP 2-4. Anything higher than MP4 and the incoming damage overcomes my lack of resists and vitality.
Happy Hunting!
Edit: typos, fixed spec link