So I am selling my 3.2 TT as my commute has just got a little bit longer (50 miles a day on the motorway as opposed to 15 miles stop/start in the city), and I will be car sharing with 2 colleagues, so I need something a little bigger to fit everyone in.

I've always wanted an Mk2 Focus ST, preferably in electric orange, but I am not sure on how the specs differ from each one. Is it simply a case of halogen lights and cloth for ST, xenons and half leather for ST2 and full leather for ST3? I'm not fussed about bluetooth capability etc as I'd likely swap the headunit out. Are these a reliable unit? I've read some horror stories about the RS having engine troubles, but is that a newer engine?

If anyone can help, that would be greatly received. I have a budget of around £4k