Etchen, Indiana GC, Dawson's, Jaqua's, Cole's as well as American Shooting Center are all great folks to deal with. I've had no dealings w/ Collector's so I have no comments, good or bad, to say about them. They have all been in the business for many years. Good deals are there and the one's up in the mid-west might have more 'trade-ins' coming in since they are predominantly shotgun type states as well as have a very heavy clientele of clays,trap and skeet shooters.
Good luck in your search.
Pay it forward - Kids are the future.
Rifles are similar to boats and young women...there's no end to how much money you can pour into them without making them any more useful.