I had a similar problem with my Focus RS..... I fitted a new driveshaft and a few weeks later had a bearing noise when cornering hard.... Jacked the car up and had all the signs of a shagged wheel bearing (play in bearing). I bought a new bearing from Ford (that hurt), fitted it and it was exactly the same, fitted a genuine Ford outer CV joint and all was good (basically the after market CV joint wasn't 100% right and wasn't butting up against the back of the bearing giving a similar feel to a worn bearing).
Steve