Few clubs are making big strides in the window to be fair.
I think our defence will look much better once we replace Dummett. But it would be daft to think we can afford/attract a brand new back line of top class defenders this season.
We're pursuing Murphy from Norwich who is another pacy wide man which will give us Aarons, Atsu, Murphy and Ritchie on the flanks which should be enough for our modest ambitions this season.
Imo Ashley needs to put a rocket under Charnley as it's the Penfold looking motherfucker that's slowing things down.
Centre back (Lejeune), Left Back, Centre Mid, Winger (Atsu & Murphy), Striker would be an ok window and achievable in the coming 6 and a bit weeks.
I don't expect a #10 to be signed this season because, like you say, they're one of the more expensive options and we have 3 #10s at the club at the minute (de Jong, Diame, Perez), none of whom we're likely to get a lot of money for and all of whom the moneymen will fancy gambling on in the Premier League. ( I wouldn't pick any of them as a starter and only Perez as an option from the bench fwiw).
I'd expect the striking situation to be addressed with a loan signing because it's inordinately expensive to buy an actual proven goal scorer for the top flight and even then it's still a gamble. Mind you, Gayle is decent and I still think he'll get double figures if we ensure there's a reliable supply.