i mean it is up for debate but personally i think Lukaku is the perfect striker, just missing a little bit of coaching to take advantage of that. I mean scores goals head and foot, holds the ball really well, turn of pace, can drift out wide to support and can drop deep to start attacks. A better coach for him would turn him into a player potentially better than drogba was. But that is solely my opinion.
I think in the grand scheme of things also, you can go for lebondowski / cavani / benzema etc but they are all at competitite clubs. Say Juve or Bayern or any other champ league club are looking for someone, do they go to real and prise one away somehow, or do they go to mid table english club everton and sign a long term investment proven to be a goalscorer?