Well, at least Cech is out of the competition IMO this year. So I guess that leave Neuer, Buffon, Courtois and De Gea. Navas, Bravo and Oblak all had worse season than last year in my opinion. Hart at Torino didn't impress to be fair, Ter Stegen improved but too little and Courtois have had a bar run of game recently. Would give it to either Neuer or Buffon and De Gea would be third. Buffon if he win the CL and do an awesome safe or something like that, otherwise it Neuer. ;)
Also where do you rank goalkeepers ? This year has been hard to pick best one for me .