i have no problem running 2x monitors @ 1680x1050 at 60fps using a 2mb GTX275OC

add another 4GB of ram to your machine.

this is how I would setup the new accounts to boost:

get another 4 accounts on your existing battlenet account (a,b,c &d)

RAF link a &b, and link c&d. (do not link any to your existing account)

use your 80's on the existing account to boost a,b,c &d