For 3D you need 3 things:-
1)Graphics Card from Nvidia only
2)Monitor 120Hz supported
3)3D vision kit which includes an emitter & one glasses
You have selected a pretty decent graphics card so you don't need to worry for gpu .They are providing you with all the necessary requirements for 3D vision so in short go for it.
So, with a GTX 580 1.5GB, will that be enough memory? (at 1080p...)
and with the monitor I have above, I am basically BUYING 3D, and can I turn off 3D? Thanks so much man!