Don't know if they are considered the best or the earliest (I don't collect modern stuff usually), but Graded & Raw 2016 Bowman Chrome Auto Refractors (Blue, Orange, etc.) seem to be the ones selling for the highest prices on EBay.

A raw 1/5 Auto Red Refractor sold on May 7th for $6,700.00.

http://www.ebay.com/itm/2016-Bowman-...p2047675.l2557