IMHO buy what you like based on your use. If you simply collect, pay for quality and you will never regret it. If you only want one yo shoot, buy the best condition non- mint you can find. I say that because while I shoot and collect, I want my shooters to look good and I take good care of them.
On several occasions, I have bought a as news in box with the intent of shooting it. NOT! Just doesn't work for me. So I end up buying a second example that I know has been fired so I have one I'll be willing to shoot. Now am very content. Just broke.