I want to run 2 accounts on a single PC but one account each on each 22" LCD's at 1650x1050. Ideally I'd like to have max settings (shadows atleast mediumish) on both accounts, but at the minimum I'd like to max atleast one account.

Does anyone with experience with these know if the above is doable?
Since I don't play any other games other than WoW at the moment, I would like to min/max the build to reduce extra heat, power usage, and go for quietest as possible as well.

I have:
E5200 OC'd using stock fans to 3.1 GHZ
MSI P6 NGM (a budget board already with 4GB ram limit - Ill need to switch a new bobo, to get 8GB as WoW just devours ram, and even for crossfire.)
Radeon 4850 <-- Would crossfiring another one be better, or else which higher end card would you recommend?
430W HEC power supply - quiet and holding up good, if crossfiring to what wattage should I upgrade?


So, what should I upgrade?
Ideally Id like to spend as little as possible, keep the heat, power, and sound as low as I can.

And finally thanks for all the info.