If you want a great New Yorked Styled cheesecake, you're going to need whipped cream-- the heavy kind, not the light. The whipped cream adds to the smoothness and body of the filling in addition to the sweetness.
Always add the whipped cream last. The whipped cream has air bubbles. So overmixing will cause the bubbles to release.
Also don't limit yourself to regular whipped cream either. Flavored whipped cream is sure to add a nice surprise to your cheesecake as well.