This is the EXACT combo that I'm using with my iPhone 4.
I love it!
At first I had the Incipio Feather with the SGP Anti-fingerprint, but I returned both of them. The Feather didn't protect enough and it looked weird with part of the antenna showing and part not. And the Anti-fingerprint protector was just too grainy for me.
So yea, NGP + Oleophobic is an awesome combo.
The Oleophobic keeps the screen perfectly clear with still a diminish in the amount of fingerprints.
And the NGP is probably the best case I've tried. Great protection, minimal look, feels good.