I think Vela is perefectly suited to the role you need - you don't need to sign anyone!
But if that money is really burning a hole in your pocket, Henri Saivet is a good bet for around £5-6million. He hasn't got it at the start of the game, but he has vast potential and grows quickly with some first team experience. He is in a similar mould to Henry, and thus is equally good on either wing if you need a shuffle round, or some back-up for the Walcott and Rosicky, wo, lets face it, spend alot of time on the treatment table.