I would say that Ambrose and Mustard are the best two keepers "for the future". At the moment Mustards batting needs a bit of fine tuning for first class cricket but his keeping is fine - apart from the odd missed appeal
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I must admit i do like the look of Ambrose though, he's had a good season with bat and gloves and i cant recall many reports of him missing much
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I'm not sure about Davies though, i watched him bat a couple of times and although he scored runs his technique looked a bit suspect. To me he looked like a "stiff" version of Mark Butcher fine for scoring against your average CC trundler not good for batting against International class bowlers!