Zydo, I am sorry but the PSB Alpha 1 reviews are not convincing to me; they have little bass. In addition, I would use them occasionally as an alternative to my main system speakers, but they would be plugged into major electronics and not a NAD integrated.
At your stated budget, the more upmarket PSB Image B6 is more appropriate, with wider dynamics and deeper bass extension. There are rave reviews everywhere including this one from Stereophile. The measurements indicate a -5dB point at 40 Hz.
Or look for a used pair of Dynaudios at your budget. They're well known for good bass extension from a small monitor.