Need new discs and pads Cal Covers

Hey all
I just got my A3 2014 2.0 TDI 16" Wheels
I want to install the best I can but without breaking the bank.

Will just list what I need, I am not sure why size and whats best.

1. Discs that do not rust, have seen a few cars around here and their discs never rust, even though we are down the beach.
2. Pads, unsure if I should just get something cheap and cheerful?
3. Covers for my standard calipers, I painted my old golf, but the dust burnt into the paint overtime and had to be redone in a year, so was looking at covers, do not want to spend more than £100.00-ish, maybe a bit more for the set.

Whats your thoughts on the above, would really appreciate it.

Thanks both.
Padgid, 1 disc in the UK is 55.00 that's 80.00 American, are they worth it?
The TRW are not easiest to find, but can be done, they are very cheap at 25.00 per disc.
Brembo are 50.00 per but not sure if all their disc are rust resistant.
How do I ensure I am getting the correct ones, my mechanic does it usually, but he is not working, I don't trust those enter your reg things, I have been stung before with those.
Also any comments on caliper covers?
Thanks again and stay safe