IMO we want 3 'fit for purpose' players in Jan. By 'fit for purpose' I mean no compromises in terms of flexibility or future development, starting quality and no converts to a position/role they are not best suited to.
The 3 positions are:
CB, CMD & CF.
IMO we need height and power/physicality in defence and midfield.
In attack we need a bona fide goal scorer who can convert our chances created into goals.
The rebuild doesn't end with these 3 positions, but IMO there is no room for compromise where the team spine is concerned, and it MUST be fit for purpose in terms of style and roles/patterns.