Need some opinions on blank sketch covers

Hi, 
 
I was wondering now that SDCC is over if anyone has had any feedback from some of the artists on which of marvels many blank sketch covers seem to go over best at the shows. 
 
I have my big local show (Fan Expo) coming up at the end of august in Toronto and want to start planning out what sketches to spend some money on.  I have heard from a few of the artists that i see regularly at shows up here that the Avengers covers were good and that the Wolverine cover is pretty terrible due to it being too glossy.
 
Any feedback or opinions would be greatly appreciated.
 
Thanks