I just had my worst season ever

Finished 5th and qualified for the EL.
Financially speaking I did really well so I was given a 54m euro budget to play with.
I've signed Ben Arfa on a free transfer. Signed Pjanic, Howedes (everyone seems to rave about him), and Galvan (for next year b/c of non-EU rule).
I have a headache trying to come up with a suitable formation with the players I've got. I'm not getting the most out of the 'good' players I have so that is making it even harder.
I still have a lot of money to spend. I'm thinking about signing Suarez. I want to sign a quality RB and a quality LB but all the ones I scout, their report reads "not much difference between" the LB & RB I already have (I want a jump in quality, not same).
This is my squad, any suggestions?
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