To make relevant suggestions, it helps to know more. For example:
* What kind of sound do you like? Sharp and detailed? Laid back and mellow? Warm and full? Cool and clinical?
* What kind of music do you like? Are you a heavy-metal rocker or a chamber music aficionado? Or both?
* What are your listening habits? Do you listen loud, or at moderate volumes?
* Besides the NAD, what other equipment is in your system?
* What's your room like? About how big? Lively or well-damped?
Tell us more and maybe we can help you more.