ABS will be a sensor more than likely, it could be brake light switch. The ball joints are utter cream there like £8 each and take 5 mins to fit per side.
sevicing is cheap and easy. why do u need bigger brakes bit of a waste of money. Coilovers are expensive shocks and springs would be cheaper.
A brak fluid change takes a few mins. And brads hoses aint really worth it i hadone burst once. unless its a race car that kind of stuff is pointless. for cheapness replace anti roll bar bushes and steering box parts nice new discs and pads and some nice tyres and a good service. be good as new