The very first person I would be looking to upgrade is Mings.
On his day he is up there with the best. The problem is that almost without fail he has a massive error in him every game. It's like clockwork, you know it will come at some point and just hope that it doesn't lead to a goal. And that sort of undoes all the good work that he has done.
A top quality striker would be great. Watkins can fight for a position on the wing.