If we end up with this window, which is realistic at this point, it would be really great and we shouldn't fear Reals spending spree:
IN:
De Jong (75 M)
Griezmann (120 M)
De Ligt (75 M)
Neto (30 M)
Luis (0 M)
OUT:
Denis (10 M)
Rafinha (15 M)
Gomes (25 M)
Coutinho (90 M)
Rakitic (40 M)
Malcom (40 M)
Cillessen (30 M)
Net spend 50 M with an improved squad.
-----------Ter Stegen-----------
Semedo--Pique--De Ligt--Alba
-------------De Jong------------
-------Arthur--------Vidal-------
---------------Messi-------------
-----Griezmann-----Dembele---
Bench:
Suarez, Alena, Puig, Busquets, Roberto, Luis, Lenglet, Umtiti, Neto
Then I would hope for Wagué or Emerson to explode at RB to make the bench, but else look for a new RB next window depending on Semedos performances (I believe he needs to start a good amount of games before we can truly write him off).
With that team/lineup we have a better balance with WC CB's, new dynamic in midfield where De Jong + Arthur-teamwork could be a breath of fresh air, while Vidal runs/does the dirty work, needed to play 3 forwards. Alena and even Puig should get decent minutes (more than Busquets + Roberto, imo), so we can ease in a whole new setup during the next 1-2-3 seasons in midfield. Griezmann will be levels above everyones wet dream Jovic, who will be benched by Benzema at Real, and everyone will realize that they can live with a goofy character and horrendous celebrations, as long as he provides a decent amount of steady goals + assists, as I'm sure he will. Dembele will bring the pace we direly need, and Messi can find him on counters, where Griezmann will be useful too. The ball flow from De Jong - Arthur - Messi - Griezmann should be sufficient to break up low defences, but of course the coach (still not sure it's going to be Valverde) needs to make them work tactically most efficient together.
The exciting thing to see is the chemistry in attack, and the potential is there to make a world class attack. Question marks are around Alba and Semedo - both could prove to be sub-par, but I think it is too early to splash on replacement for either, as Semedo hasn't had enough continuing playing time to write off, and Alba despite that he cost us CL last season had one of the best league seasons, and therefore could repeat that.
With some proper tactics, with a more attacking mindset and style, I think we are much better set than Madrid, our main rivals for the league. They have a lot of exciting talent, but unproven on the big stage and that is risky because league titles require continuity, which we have with proven world class players.