At only 23 years old, if he's a success at Villa and moves on, he'll be worth a lot more again. If he's not great (and I personally think he would do well here), he'll still have a good sell on price.
He's big, strong, has a good touch and a he'll of a left foot. We may even get a few from corners, with him and Vlaar following Carew and Laursen in that mould.