#3 Arsenal - Emi Martinez
The Arsenal goalkeeping situation is a bit of a conundrum at the moment - Wojciech Szczesny has landed up in Turin as a backup to Gianluigi Buffon, and it seems as though David Ospina and Peter Cech will remain to fight it out for the #1 role.
Goalkeepers spend most of their developmental years on the bench anyway, and with the right coaching, it is conceivable for a rookie goalkeeper to be thrown into the deep end and be fine. However, Szczesny noted that he learnt more in 1 year of AS Roma than he had in his entire career at Arsenal, which points to an issue with Arsenal's goalkeeping staff.
Emi Martinez is highly, highly rated - Arsene Wenger had no problems starting him for Arsenal, while he has already been called up for the senior Argentinian team. A season where he's unlikely to get any first team action aside from the League Cup would be better spent playing for a newly promoted Premier League side or in the Championship, as he's being groomed to eventually take over from Petr Cech when the legendary goalkeeper calls it a day.