Between Downing, Adam Johnson, N'zogbia, and Mata.
Any of them would do me fine, they are all good players in different ways. Mata is a bit of a risk, but the way in which he oozes class suggests he will do fine wherever he goes. Downing can do the basics correctly, and is a good leader with good experience. Johnson has endless potential, and given proper time and coaching could become a great. N'zogbia is probably my least favourite due to his history with Andy Carroll, and he does his best work from the left flank.
Any thoughts?