Luka modric with his 1goal, 2assists, simply is not better than anyone with 7 goals and 7 assists. that's simple as 1+1.
Problem with Toure, he's playing at City, so that's honestly not someone i'd like to see at united. Then, his salary will be somewhere around double what you would pay for Adam.
Bale, Sneijder, that probably won't be possible. i would give Adam a chance, indeed if he comes for reasonable price/salary....