i have an asus 6970(unlocked 6950 2gb) that OCs pretty well. im not 100% happy with its performance so im selling it. i would like either a gtx580 or gtx570 and im wondering if its going to be a fair amount of improvement. games i play are crysis 2 and COD:MW3, sometimes portal 2. before you tell me to wait for 6 series nvidia or go 7k ati keep in mind, im selling my card to get another used card and would like to get another DCuII card for around the same price i sell my card for. NOT LOOKING TO SPEND $200+ more. i HAVE looked through reviews but numbers dont tell the whole story. wanting to know from someone who may have had a similar upgrade and could shed some light.