Do the bore kit seperate - then when you want to do cam, oversized valves, springs etc... do the port & polish. You do have to take apart the top for both but the bore kit just requires the jug to be machined; the cylinder head itself gets the cam sprocket removed and is just set to the side.
To port & polish at the same time would cost you extra in labor - if and when you are ready to do a cam, some oversized valves, springs, and P&P it will be cheaper because the seats are already being re-cut anyway for the P&P (so just throw the 1mm valves in) and the cylinder head needs to be taken apart and re-assembled then and doesn't with a bore kit.