If we do sign Young I can't see us spending much more. De Gea, Young, possibly Varane. That's a good 35m-40m right there.
you'd only need to add in a CM and you'd be completely gravy for next season though, assuming you got rid of Scholes and Hargreaves off the wage bill + the usual sell a couple of youngsters to bring in 10mill or so and you've still got a pot of money available for a good signing.