Don't worry about wages if you progress well in CL and CUP, keep your stadium full, wages will not be a problem. Good GKs come at different ages and Qlty, so its not a deciding factor, but you're are at a lower level so a younger GK maybe the way to go, he will progress with you as you advance, if he is a good trainer, look long term.
But bottom line is, performance, performance, performace in the big games! MOTM, game wining saves and high morale these factors rarely are linked to Qlty, Age or wages. Maybe a SA?
So, play them all and see how they do, sell the loser.