Quote from Luto:
Currently the Dell NVidia card lacks a fan on the GPU.
( 128MB DDR GeForce FX 5200 Graphics Card with TV-Out and DVI)
User reviews claim gamers are having overheating problems and getting crashes. You probably won't put that much pressure on the card, but it overheating is the kiss of death to chips.
So I would upgrade to the ATI which does have a fan. The ATI card (9800 Pro) has been between a $115 and $140 upgrade.
It will be a great card and should have very good performance and be adequate for your needs. Also keep in mind that the quality of the signal can degrade on the second monitor.
Cheers