Depends on your age, what type of mods and your drivign record mate, but all things being equal a stock adm Sprinter would be cheaper to insure than any import.
If you intend on modding your car I suggest you see somewhere that specialise in modified cars like Vigil or Shannons. I have 3rd party property on my ae71 and i think its about $300 (I'm 22, max no claims)