6 grand will get you a tidy ST. To be honest my old st170 was the most disappointing car I've ever owned, it handled well but was so slow. A few mechanical issues too, Ford never really did get the VVT right.
The ST is miles better than an st170, although in standard form they dont feel that fast, by the time you've had it remapped and breathing a bit better it'll chuck out a reliable 300bhp which is enough for the road!