This was the starting 11 for Spain during the game against Belgium. For me I would of changed Senna for Iniesta and put Joaquin on the right. Everything else looks good. I know some of you are going to argue that you need a defensive person in midfield like Senna, but it is possible to have two offensive center-midfielder and still be able to protect midfield.
This line-up is fine & brings out the best in Spain. Senna allows Xavi & the rest of the midfield to work their magic by breaking up play & bossing the opponents around. You could try two offensive players, but there would be no balance in the team.