The GSO is more powerful I think, but for the use you have for it, it won't change a thing. However, it would save you the trouble of the HDMI to DVI cable (but it cost more and you have to pay shipping). In the end, either way will work just fine.
That has 2 DVI ports (in case you don't want to buy the adapter) and it costs 40$ with MIR. I just bought one recently, and it works flawlessly in a 600$ build with an Intel C2D. Just my suggestion, in case you want to stick with Nvidia.