It will be quite difficult to sell a .us but in this case it is quite a good and short keyword so if I were you I would try to sell it anyway. It won't get much natural traffic hence parking it would be a very good option. Hope this helped, NoaJou
I will say $1000 after some years(5+) add some years upload some content, get some pagerank than sell it. Now .us domains goes to low.
Nice domain name bus .us domain names are really hard to sell. People are looking for .com domain names and only if company succeeds with .com name they are looking to protect their brand by acquiring .us and other extensions. You can try to list it on Sedo but no guarantee selling it. But if you are trying to establish it then you can build almost any website on it because it is neutral name and will work well for many niches but remember that you can get users from US only.
As it is a short domain name so it has value, it has value more than registration fee, try looking for buyers and try to get appraisal from any experienced domain seller..