If you had $5k and a 30 day time table ......

[probstein123]

buy autos without coa's , get coa's and flip them fast, not sure if this can be done in 30 days though

[Paul S]

Going strictly by your four choices I would go for the first. I can get a beaut of a card for 5K that someone would surely want-- and I only have 1 card to flip.
Second choice, more cards to flip and can't be sure I could get rid of them all within 30 days.
Last two choices, turn around time in getting them graded cuts down on time to flip.

[Wymers Auction]

I would purchase the best 1958 Topps set I could find. I have had really good luck flipping this set.