I dont really know if you can find any good upgrade for 80mil. Save more money and buy some superupgrade. I dont see a point to upgrade to just a little bit better item. Im pretty much at same point with my barb. Maybe new gloves would be your next upgrade like the guy above me said.
EDIT: Im trying to now save about 500mil and buy one or two upgrades with that. Maybe only one godly item. Im having a competition with my friend that who can get 500mil first..