From here, ideal / semi-realistic window would be Onana, Timber, Rice, Mount, Hojlund and Orban. Obviously we would also want to be rid of anyone unlikely to be getting minutes.
There was a statmandave youtube video released yesterday about which young striker we should sign, and the three options were Ferguson, Orban and Hojlund, who are exactly the three I would want for the long term (Ferguson joining at a later date). I don't think three is too many when we will be playing 60 games, rotating our options, and sometimes switching things around to play two up front if we are chasing a game, or just want to mix things up to give the opposition a new set of problems.
I am very optimistic that ETH a) knows who he wants to sign, b) will be able to convince them to join his project, and c) will get the best out of his players. My concern is we get taken over by the Qataris and they start buying playthings like Neymar, Mbappe, etc., who are all expected to play in the big games, and we lack the grafters like Rice, Mount, Casemiro, Martinez, etc. With three of the top five players in world football, what did PSG win? They even managed to finish second in a one horse race!!!