It is more expensive to re-sleeve existing cylinders, but one advantage is that they can use stainless steel, which will resist pitting and will last longer than brand new ones. I recommend you explore this option and then decide if you are OK with the additional cost. The last time I had this done it was about $90 per cylinder.
That's a lot more than I had anticipated spending. The stainless sleeve is appealing though.
One other question I had is if I could run cylinders with a larger bore and maintain my braking power? In theory a larger bore would give you more stopping power. But, can the master cylinder and booster move enough fluid to move the larger piston in the larger wheel cylinder?