I had a st200 and loved it but this was nearly 10 years ago, I should think it's not as nice to drive now as I remember it being. It did go well though and with the k&n and blueflame cat back it was the best sounding car I've owned it sounded so nice. I think the focus and fiesta st are pretty similar, both heavy on fuel and not as quick as the competition. If it's what you really want then get one but I'm with the others that have said look at other stuff. I bought a stage 2 Octavia vrs last year for £1500 which was around 250bhp, nice to look at, no worse on fuel than my old 170 I'd say but pulled like fuck. Could of sold the parts off it for a grand I bet as everything was forge, miltek etc.
The 170 did handle really well and had good brakes, stick a rs engine in and I'd have one