There are probably only 5 or maybe 10 keepers in the world who would be a noticeable step up from Howard. Really, there is no such thing as a perfect goalkeeper, as it really is a tough position. On Begovic, again, he'd be quite expensive. and I know Stoke have opened up their style of play somewhat, but he's still spent the majority of his time playing behind a Stoke defense and midfield that breaks everything up in front of him, not requiring him to make many last ditch saves.
The people who are so critical of Howard are ridiculous.
*Editi* For Howard, I apply the Hafnia test. If Haf thinks a player is good, then he must certainly be good, as Haf tends to be on the critical side when evaluating player performance (No offense, haf).