I don't have any specific recommendations, only some words of advice when it comes to brakes.
Specifically Master Cylinders. Bigger isn't always better. I can't count how many times I've seen someone install a larger master cylinder and do nothing else and think they've made an upgrade. A larger master cylinder will move more fluid for the same pedal travel travel. You will find that the brakes engage earlier, this will mislead many into thinking they've improved the braking performance. They have improved the pedal feel, but if nothing else has changed, they've actually reduced the amount of pressure in the line. Going from a 1" MC to a 1.125" MC reduces the pressure by nearly 20%. If you haven't made other changes to compensate, the brakes may feel firm, but you're going to have to push a lot harder to get the same braking performance.
That being said, you've got C5/C6 rotors and calipers, so you've already made an improvement there. Bigger rotors than stock and more piston surface area at the caliper are both upgrades. But, the increased surface area of the caliper pistons has the opposite effect of what I said before. You will have more clamping pressure on the rotor itself, but you'll have increased the pedal travel and the brakes will feel soft, even if it hasn't diminished the performance. But this is where people make the mistake and then go to the bigger MC to compensate for the pedal feel. So now it feels better, but the actual performance is worse. In addition to changing the MC, you'd want to upgrade the booster to a larger diameter, or from a single to a double diaphragm if possible.
If possible (I have no idea if they'll swap) but I'd try and go with a matched master and booster from a C5/C6. That'll be a pretty safe bet. If you're going from factory drums to discs, you'll want to make sure that any sort of residual pressure valve is removed from the system and then find a matching rear proportioning valve (or adjustable)
