Like I said, it's entirely your choice but to get a standardish Focus to perform anything like other cars, then you're looking at spending quite a bit. You can pick up any of the following for similar money and better equipped out the box. Obviously I'm going to say Clio 172 but others include Peugeot Gtis especially 306 Gti6, Golfs, MR2, MX5, BMW 3 Series, they all would basically just need a brake upgrade then ready to roll. To get any Focus to be better than a 172 or a 306 Gti6 you're looking at nothing less than an RS Model or equivalent performing i.e. highly modified lesser model. In my list you should pick up something suitable for AND basic track prep mods for about £1250-£1500. Mine was £1400 for the car then just done Brembo discs, Ferodo DS 2500 pads, braided lines and dot 5.1 fluid. Job done. Can get a 172 from £1k. As I said before I love Fords but there are more suitable alternatives out there.