I would go PSA slabs for all, for the sake of uniformity, protection (I think T202s are a bit fragile due to the hinged sides,) and resale value way down the line.
If you go SGC, you will not have uniformity - your current SGC cards will not look like your newly graded ones due to their flip redesign.
As to that one Cobb, you could always look to sell the one you have and buy one already in a PSA holder, or make a similar trade. If it was me, I'd let it be the last thing I'd deal with. Leave it in the SGC holder and maybe display it as the centerpiece card in the collection for now.
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