I'll be looking to purchase a new car towards the end of the year. My budget will be 7 - 8k. I like a car with a bit of oomph to it, but have a small family to carry around so can't go for 3 door hot hatch or MX-5 type cars.
I've done a quick search about and the Focus ST170 and Honda Type S (why don't they do a 5 door Type R!!) seem to crop up as potentials.
The ST170's a really nice car, handles very well but it could do with a bit more power and a bit more character. Have you thought about the Ibiza Cupra series or a VW Golf GTi?
Have you thought about something like a Subaru Impreza? The image isn't my cup of tea but even the basic turbo is reasonably quick.
Or something like a BMW 3-series or Audi A4? 2.8 or 3.0 litre versions of these will both be within your budget and give decent performance without the council-estate-grand-prix image.
If you don't want a hot hatch I'd go for a BMW 330i which would probably be around 6 years old. A 325i is pretty quick too if you wanted something newer.
Vectra, 3rd fastest 4 door in the world? I doubt it mate!
Countless Mercs, Audis, BM's etc are going to be quicker although maybe limited to 155mph but Brabus make quite a few "production" saloons that will bust 180mph...