LB, CB, CM and striker.
All of these should be above any other position.
I don't know Si, whilst I think that CB will be a primary position for transfers, it would not shock me to see Klopp at least 2 speedy wide players before he starts worrying about a CM and LB. As far as up front goes I think we buy 3 the question will be how many are out and out strikers...i'd say 1 if Danny stays and perhaps 2 if he goes.
For CM, if Phil is moving centrally then I honestly think we have enough cover with Henderson, Can, Grujic, Gini, Lallana, Lucas, Phil....we might pick up one more but moving Phil into the mid does mean more is needed up top than ever.