All great players, but I think that Posey has the makings of a HOF catcher. It's too early to tell what Strasberg will be doing in the next 5 years due to his fragility. Harper is solid, but I think Trout is better by a percentage or two in all categories. I'd gamble on Posey to end up with the better career of the 4, with Trout and Harper tied for second and Strasberg the long shot of the group.
I guess if I saved used tinfoil and used tea bags instead of old comic books and old baseball cards, the difference between a crazed hoarder and a savvy collector is in that inherent value.