Tarkawski is decent in a no nonsense stopper type way. You don't need all your defenders to have Cruyff type ability on the ball, so long as he can find a teammate. He would be a decent option although I would have preferred a bit more pace I think.
£120k pw is crazy, but if part of it is framed as a signing on fee then hopefully it won't break the wage structure. What would he be worth if for sale under contract - £20-£25m?