boy, thats a big question. totally depends on how you are going to use it.
Alot of guys will say don't bother with something that cheap, and save up for a good leupold or nightforce.
I would agree with them after replacing all my "cheap" scopes with nightforce and good leupolds.
But there is nothing wrong with nikon glass, and I think you could get something in the $300 range. to tell you the truth I have no idea what is a good scope in that price range because I havn't looked in a long time.
go ahead and use the search button on here, and type in scope, and then start narrowing your search from there. there is a TON of info on the this site, keep reading you'll learn a lot.
good luck