Assuming you have some elbow room - hard to beat a used pair of PSB Stratus Goldi. When they come up, they usually can be had within your budget and your NAD will drive them splendidly! When they were new, they were very highly reviewed by many publications (not that that counts for too much, but it's better than nothing!)
The Stratus Silver and Bronze are good values, too!
Good luck!
The Stratus Silver and Bronze are good values, too!
Good luck!