For me we should be adding something like the following:
Giuseppe Hart
Kevin Strootman / Morgan Schneiderlin
dembele from Celtic
And a centre half of the calibre of Manolas or VVD
Those are all realistic in terms of cost and in terms of the next level player we can attract
And, if we really wanted to push the boat out add Cesc Fabregas.
That's about £100M plus Cesc plus wages. If we really are on a "project" then let's do it with a sense of purpose, show our intent and make people sit up and notice. We've got half a season left to build some momentum, try formations etc as we're out of the cups and not in any relegation threat. Use the time wisely.