Can't really imagine who we could get for decent money that would be as good. All of the English crop before Hart have thrown away their chances with the same kind of blunders; Green, Robinson, James, Carson, Foster etc. The current top list in the EPL is made up of some very expensive goalkeepers, and I'd rather we have a stable goalkeeper, like Tim Howard, than throw cash at a position where I don't really think we need to improve on our 1st choice. We need backup though, and Mucha doesn't look that interested in just being number 2.
I don't really know what would be a good place to look for younger, cheaper alternatives but I'd expect northern europe as the football is more about the aerial battles and command of the area.