I would use Mascherano money to buy two good CM, with one of them being very accomplished as a DM.
Something like
Kacar/Hamsik
Kacar/Defour
Veloso/Hamsik
Veloso/Defour
My reasoning is that all indications point towards us having a Season of rebuilding, and in such an even i would hate to have a Soft Central Midfield and A big gaping hole at Left Back. Sadly Lucas and Aurelio as first teamers means we are looking at exactly that. Lucas - because of the lack of talent, and Aurelio because of lack of consistency and the ability to keep himself fit.
To me, getting an LM and a backup Striker comes after that. I get, why everybody wants to sign a striker first. The cliche "goals win games" comes to mind. But in real life, teams that stocked up on Strikers without reinforcing other parts of the team have always done poorly. Newcastle, Manchester City, Real Madrid in the last few years. I can see why fans want to see attacking players signed, but if that comes at the expense of the balance of the team, then i would much rather not sign a striker.
I think we can get by till January with Torres, Jovanovic, Babel, Kuyt and N'gog. If we get a striker, then one has to leave. We can't just buy 5 strikers and keep when the total Squad size is limited to 25.