For best results measuring FP, the spyder II should be placed ~1 feet from the screen, facing the screen with an up/down angle pointed to the lens of the pj. The Spyder II can indeed be used for FP, but not with all of the bundled software packages. There's a couple of third party commercial and non commercial applications with Spyder II support available. Check out Color HCFR. It's free. And it's awsome.
The sensor is the same in all Spyder II packages. Go for the cheapest one.
Or even better. Buy a good sensor instead... Monaco OptixXR (xrite DTP-94), or eye-one display 2 / eye-one display LT.