I think people here are focusing too much on replacing Suarez the goalscorer. He's much more than that - a real meat and potatoes player if you will. The attack is built around him because he plays so many roles - back-to-goal, facing the goal, pulling defenders out on the wing. It's his work rate, skill, movement and desire to win (rather than just his goals) that makes him so special and so difficult to replace.
We already have someone who can be as good a goalscorer (if not better) in Sturridge. I can't imagine why then we'd want no. 9's like Lukaku and Bony and Martinez to replace him. We need a versatile attacking player who'd take up a large chunk of the work rate volume in the attacking third. Reus, Markovic and Sanchez seem to be much more players of that ilk.
I'm not quite sure about the idea of a "meat and potatoes player" (though Rooney immediately springs to mind) but otherwise I agree.
I don't understand the thinking behind bringing in players that would either force Sturridge out wide or the team as a whole into playing with a more traditional strike partnership.
Suarez was / is a force of nature on the field and as amazing as his goal scoring record was we need someone who can bring that urgency and creative spark as much as the goals.