I would probably go with Gotze. He turns out amazing in my saves (and he reaches his potential at quite a young age so he'll perform for you for a very long time).
i agree...gotze is best for chelsea /for me in 4 seasons had averaged between 7,70 and 8,20)
di maria is best for clubs like arsenal,bayer,liverpool) etc
chelsea have enough cash to buy gotze and at least two more players like him
belhanda is quality but not enough for chelsea (he was gread for me in bayer, montpeiller, napoli and fiorentina) but he still isnt chelsea material