Who is? Suarez is the third best player in the world, not many teams have a player of his quality.
Clever business is about upgrading with the "right players" - you buy a top class CM and if he performs well (bearing in mind there are no guarantees on how a player will perform in a new country, new league, new team, new formation, etc) then he ousts the current CM and you have achieved brilliant depth.
You don't sell off players (particularly ones who's goals are the only reason we're not languishing truly midtable right now) in the hopes that their replacements will perform to a similar standard, nevermind a better one.
Attack
I would be looking to bring in Origi and buying the best forward we can lay our hands on.
Securing Sterling long term.
That's; Sturridge, New forward, Origi and Sterling.
Midfield
I would be looking to bring in the best CM and AM we can lay our hands on.
Securing Henderson long term and retaining the services of Lucas.
CM - Lucas, Allen, Henderson, New CM, Can.
AM - Sterling, Coutinho, Lallana, Markovic, New attacking midfielder
Wingback
I would be looking in bring in the best winger/wingback we can lay our hands on
WB - Ibe, Moreno, Flanno, new wingback, Markovic, Manquillo
Defence
I would be looking to bring back our kids from loan.
So four signings to support and challenge the players already here.
I'd also be looking to offload as many players who contribute little or aren't suited and use the additional funds from saved wages to secure the likes of Henderson and Sterling and to secure top talents because a premium will have to be paid if we aren't in the CL.