Quite a bit of options. R8000 GS can run 11-34 natively or possibly up to 11-40 or 42 with/without a roadlink.
Personally I have an 11-36T rear with a 46/36 front. Have a set of 46/30 rings that I am going to replace the front with to help with 20-30% grades offroad.
If I were you I'd put a 50/34 front (48/32 is even better) and an 11-36 rear and you should be able to do 99% of the paved roads in LA.