ohhhhhhhh thats a hard choice. Their both in the same level with each other in terms of performance. But both sound completely different. You will like whichever one you think sounds better to you. It really depends on the speakers and such you will be using as well.
NAD - warm, laid back sound ROTEL - cool, front row seating sound
Me and my friend own a Nikon D200 (same choice). But when it came to integrated - I went with NAD and he chose the Rotel. You need to audition both and then decide what you like. Also depends on the "type" of music you listen to. Make an extra effort to listen to both before you invest. Good Luck.