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G. MainesA type card collection is directionless without a theme, imho.  For example, at one time Leon's theme was ACC designated pre-war cards only. (that is two not very restrictive limitations).  Other themes could include: only HOFers, only pink cards, only post-1930, only t-cards, etc.  By setting a limit, your goals become manageable, and a "list" of priorities can be considered.
Good luck!  Designing your own set is way better than chasing someone else's idea of a set.