The original 106 GTi brakes are excellent but if you want better, especially if you are improving your engine power, then you'll need stronger ones with less brake fade.
For just a pad upgrade, I would recommend Ferodo DS2500's or Mintex 1144ís for brilliant braking and very little fade.
106 with 292mm brake discs
Rather than paying out for aftermarket products, why not consider the Peugeot 306 GTi-6 or 206 GTi braking system , it is a lot better than your 106 brakes due to the normal extra power and weight they have to cope with on the 306. You will however need to be running at least 15" wheels to fit the discs on and also the callipers are really hard to get hold of unless you pay full price at Peugeot.
A very good alternative for the 306 GTi-6 brakes are the 307 brakes!
Another alternative is buying a set of good quality grooved/cross drilled after-market discs and calipers. Regardless of what you do, remember to buy the best quality you can afford for brakes, as they will more than likely last a lot longer and be able to resist higher temperatures.
Article written by Ian Dews. 'Courtesy of Ian from Pug106GTi.com'