My initial suggestions would be as V890.
The N750 with NM800IR is a cracking setup and ideal for foxing at the ranges you refer to.
The Archer in a Gen 3 D also comes into budget and is a superb piece of kit for use as suggested as handheld spotting and then attached to the riflescope quickly.
However with 2k to spend you could go N750 and the excellent Recon 750 hand held as a spotter too bang on budget for best of both worlds.
Buy Pulsar Recon 750 Digital Night Vision Monocular - shop at suppliers Scott Country
The new Photon 5x42 is mentioned and that is the new device from Yukon which I have been using for several weeks now as a demo unit and is great but is for shorter range use that you look for particularly for shooting at 200yds as it will offer spotting/detection out to 190m max. Realistically it is ideal for .17hmr use at night, and occaisional foxing on bigger calibres, but for a dedicated foxing rig, you do need to spend more to achieve a regular longer range recognition range.
We offer a 7 day demo service which allows you to try at home for 7 days before you buy. (Conditions apply) why not try an N750 and Night master at home first then make a decision
More info here
Night Vision Demo Units - 7 Day Trial
The service is there to allow people to make an informed decision so take advantage of it where you can of course we are happy to do.
Best Regards
Paul