Personally my first choice would be Schweinstieger, followed by Modric, Sniejder then Nasri.
I think Sneijder is a world class player but I am concerned that he isn't, as some people suggest, a Scholes type replacement. Paul Scholes got through so much work in his prime, he wasn't quite box to box like Keane but still, he had more energy to his play than Sneijder does. Sneijder is a player that floats around, gives short sharp periods of creative play and then waits until his next involvement. He doesn't go looking for the ball in the way that Scholes would. However, I'm sure that he would adapt to a deeper role and that's something that many great attacking players do as they get older. Sneijder is currently in his peak years, but it woud not be a suprise to see him develop into a Pirlo type midfielder in the future.