-GeForce 8600 GT should do it, 'least thats what I had. Its 8800 GT now.
-It is in some parts. When you go to Ammon Jerro's hideout and climb the big mountain, the scenery is spectacular. The Shadow Plane in MotB is really cool-looking too, if you've zoomed in some. Don't remember much of SoZ since I only played through it once, but the final battle site was impressive.