To my mind a Case VAC tractor (not an acronym but and actual model designation) is something desirable. Mostly because that is what we had when I was a kid. It only did duty pulling a small John Deere Model 12A self powered combine. As I understand it, the VAC could have run a PTO powered model 12 but it would have been close to the limits of power output for the little tractor.
As far as I know the VAC came in either wide or narrow front ends as well as an orchard model that had a smoothed over body to keep from catching on branches.
Currently I don't have a need for another tractor, nor another project so for $2K (that is two thousand dollars in United States money for the acronym adverse) would be a big stretch unless it was in show quality condition. Likewise $800 for a running but rough unit would seem about right if you are looking for a restoration project or just something for little odd jobs and occasional light work.
Location is probably as much of a factor as condition, although it is small enough to be easily transported on even a small car trailer. Generally I tend to want to preserve old equipment but time, finances and practicality have to be considered as well. For example I have a 1967 Ford F600 truck that is in pretty bad shape but it runs and operates for the limited amount of use I need it for. Occasionally I look at it and think "man, I need to restore this neat old truck" then I look closer and realize it is just too used and too broken for that much effort even if money were no object.
For certain there are old tractors and other equipment that are "just used up". Only you can decide what you are willing to spend and if what you are getting is worth it or not.
If you have any pictures of the actual tractor you are considering please post them.
Best of luck in your decision making.