Ah, foolish question then...thanks!
My monitor at the moment is capable of 1680 x 1050 but I will be using a 1080p 52" plasma as my secondary monitor since it will be my media center.
Budget wise I would say preferably in the $100 range and certainly no more than $150 (this computer simply isn't worth investing anymore than that).
My motherboard was designed for SLI but I was considering possibly getting an HD 4670 GPU as the prices on these seem to be better for the performance you get.
What do you suggest? Thanks for your help.