My starter motor has started no starting

I beleve there is a difference between the turbo starter and other starter motors, is this true? I know the starter off any cvh will bolt on and work but are the internals any different to cope with the heat from the turbo?

This is my second starter to go in 12 months, last time it went i replaced it with a £30 starter from the local car accessory shop. Am i best off goin to ford and paying the extra £££?

Also there is a heat sheild available from ford to cover the starter and solenoid, any one fitted/used one?