[Griffins]

Some of the cards that aren't listed as short prints are a lot tougher than the listed short prints.
I was the underbidder on one card I needed- one of the last 2 I need. Should've been a $30 card, my snipe of $178 was topped. I know a few other people that needed a few of the other cards and that certainly must've helped drive the bidding.
Right now you probably have 5 or 6 people working on the set in all 4 colors and Crouch, Coffman and a few others are on a bunch of wantlists.

Val, red backgrounds are by far the toughest, with blues a distant 2nd. Yellows and greens are pretty equal as the easiest.
The shortprints are tough, but as I stated above some of the others in the last 6 or 7 cards of the set (excluding #33, Mel Ott) are arguably tougher than the short prints.