Norman,
Although many people seem to recommend fitting the race master cylinder, you might want to fit the bigger brakes without the new m/c first and see if you like it. I have the AP 4 pots but a normal m/c and it seems fine (in my limited experience). Could save you some money. If you don't like it then you can always buy the m/c later.
From reading previous threads on brakes, the race m/c gives a very, very short pedal travel which probably takes some getting used to.
Shaun
Yellow SL #32