For a buggy I wouldn't suggest anything fancy. I would stick with getting more functional stuff rather than nonfunctional fancy stuff. But, for fancy and functional I would get the graphite rear shock tower or the front shock tower. I've never had a problem with the stock ones though. My buggy if stock and have no need to hop up anything else. If its stock and it was my buggy I would use a S3004 standard BB servo for throttle/brake because its all you need and would use the money saved on a HS-945MG servo or a S9405 servo. I'd but a fioroni sliding clutch next for ease of use and to eliminate 3 shoe clutches becuase of their lack of tuning and you wouldn't have to put any more shoes on. I wouldn't get any other chassis part unless its needed, say if you actually bend and break the front tower, then get the CNC one, but anthings up to you. But if you have limited funds then you should keep extra for breaking parts. Oh yeah I broke 2 things, the upper turnbuckle, the really thick one. To fix it I just cut a the head of a machine screw off and used the body for a spare. The other thing was a front arm. Both boke because I hit a car tire and the side of a building going about 10-15MPH.