Not sure it has to be either/or. Maybe think about buying stuff over time, so you get the benefit of some dollar cost averaging. If the market moves down, then you can capitalize on it because you kept some dry powder. And if prices move up, then you still have the cheaper pieces that you purchased earlier.
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Trying to wrap up my master mays set, with just a few left:
1968 American Oil left side
1971 Bazooka numbered complete panel
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