Integrated to match Von Schweikert VR-2

look at a bv audio demo a300s or a blue circle cs integrated or if you want to go tubes cayin ta 30. forgot about the music hall black mambo.

I have heard the Aronov LS960I integrated amp drive your VR-2's with excellent results. For $1150 to $1350, here on Audiogon, an unusually solid build quality, elegant retro styling, and musical, accurate, sound quality. Has an ability to elicit the best possible bass, even though tubed.
There is no built-in remote control, and the dual mono volume controls are not always intuitive for an audiophile's other household members. Aside from those points, easy to recommend.

I used a McIntosh MA 6900 to drive the VR2's with splendid results. A used one is still more than you want to spend but the MA 6500 is in your price range. I would think the NAD you have would do the job--are you sure you might not want to consider a source change instead?