Required option parts for a yz-2

[11Gtollman]

hi all.

I'm thinking about getting a yz-2 (currently have a b5m with a low rider gearbox) and was wondering what option parts are good to get? I know lots of people highly recommend and highly recommend getting the bmax 4 arms and the bmax 2 driveshafts, but is that the only main one worth getting? I know there are Gill wing front arms and a ball diff and under lipo weights etc, but are things like those worth getting? Also, are there parts of the car that wear out or break easily? Thanks in advance for your help!