That model will not give track numbers on the MFD. You do have Bluetooth, don't you? If not, that will be the one you want - as you don't have the display for the track names.
The Quadlok connectors are the same between all the headunits you list. I think the reason why Seat say that the Ipod adaptor isn't suitable for cars fitted with the Aux in is that you will lose that if you fit the Ipod adpater - they must both plug in to the same port - the 6CD autochanger port.