keepers

ok we all know we have two gk's as good as each other but prone to mistakes and because of the mistakes of one the other has been picked for last few matches.....now when a gk makes a mistake it is worse because a goal is normally the result and so its highlighted even more.
now before this season and last season had started I had hoped we would sign a keeper and the one I always wanted was schmeichel at Leicester but with them winning the league and going into the champions league well that was a non starter and when this season has finished and Leicester go back to well being Leicester they will lose there key players and that keeper will be snapped up by Liverpool imo......so who is out there that can help us improve our gk position? begovic at chelski or now I hear hart if we stay up although I am not a fan of his.....we had the great man ludo but parkes is the best gk I can rmbr us having...for most clubs the position is an issue from cortois being hailed as the best then being lambasted for letting in a Charlie adam special from the half way line gk's make mistakes like every other player but when they do its a key mistake....so should we look to move either one on or should we coach them better and try and make them better?