Leroy Fer (currently out injured with a ruptured Achilles) always looks decent whenever I have watched Swansea. He'd be a good addition to our weak squad.
The obvious one would be Johnny Evans if it's only going to take £3m to get him! He's got to be an upgrade on the likes of Lovren and Klavan.
I wouldn't touch Shaquiri now, he is fat and lazy and will go down as another talented footballer who never wanted to do the hard work.