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T206CollectorGet the whole lot of them graded by SGC. If you have any questions about any of their grades, you can actually call them and talk to them. Plus the cards look great in their holders and they guarantee the grades and authenticity.
However, any PSA 8's (and to some extent the 7's) should be left in PSA holders to the extent there are any population scarcities, which drive the market for those based on the Registry game. But, again, to the extent we're not dealing with low PSA Registry population grades, then you ought to have them all graded by SGC.