Aye I had an S-Max. Thought the spec I had will still set you back £15k.
I'd say Ford Galaxy or a Seat Alhambra. It depends on the 2 rear seats and what they are for. If they are to be used regular then you need to look at a Galaxy/Alhambra at the least. If they are just temp seats for now and again, then an S-Max will suit.
We replaced our S-Max with an Alhambra in the summer as the Alhambra is a genuine 7 seater and has isofix throughout which is usefull with lots of kids. Also sstill get a boot big enough for a pushchair when rear seats are up. The S-Max has almost zero boot when rear seats are up.