Who do you think is the best challenger for the Klitschkos?

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The Klitschkos have dominated the heavyweight divisions for some time now and it seems more and more that there isn't a decent challenger for them. Who do you think is the best heavyweight boxer besides them at the moment? Personally I like Tyson Fury but I don't think he has decent defence skills and he proved he can be knocked down by journeyman which can prove fatal against the Klitschkos. Adamek is good and I like him but he already lost miserably to Vitali. Pulev is from my homeland but I don't think he has a strong KO hit as he win most of hits bouts by points. Alsohe showed that he can't take serious hits when he fought against Travis Walker. I think the guy you hake to keep an eye on is David Price. He has a very good technique and he seems to have an amazing power - 6 first round KO's in 14 bouts. So, what are your thoughts?