50 miles a day, I probably wouldn't get a Mk2 ST as the fuel economy is rubbish. I get 20mpg around town.

Don't bother with an ST1, that's usually ex-police. Easy to spot as the headlights are halogen and don't have headlight washers. ST2 has cloth and 5 seats (option of 4) and the ST3 has leather and 6 disk Sony CD and 4 seats as standard (no 5 seat option). Older spec Mk2's had chrome headlights then Ford gave them black ones around '07' onwards.

look out for clutch issues if remaped, if there are some, get an RS clutch. Drive shafts & water ingress in the boot & footwells.