If you're looking for Jackie or a Williams, a nice Exhibit is probably the best option from their playing days that meets your budget/grade criteria. Base playing-days Topps cards in EX+ grade will likely exceed your budget limits. There are plenty of late career Aaron and Mays cards that would fit the bill; personally I'm a fan of the 1972 Topps design, and they're within your budget up to PSA 8 condition. 1964 Topps Giants would be a great choice for Mays, Aaron and Mantle.
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