Guns, as investments, are much ado about nothing. A prized gun, as a family inheritance, can far out weigh any return on investment. Buy the best you can afford, that fits you well and that you can shoot and enjoy. Then pass it on to a family member who will enjoy it after you are gone. If you have a family member who you know will enjoy the gift then make it very special. Make a journal with pictures of you and your gun to give the journal along with the gun for the family to enjoy later. Fifty photographs will be much more important than a few dollars in increased value when you take into account inflation.
If you buy good solid value today they will still be good values years from now. Had you asked ten years ago I would have told you to buy A&D boxlocks or good hammer guns. Most of the real great value buys are gone but they are still priced as reasonable as anything you will be able to buy. The hunt is where the fun is not the act of the purchase. So look and enjoy your quest.