Fiesta ST is out too late for me, I want to have my car replaced by the end of this month and don't plan to change again for at least 12months.
If the Fiesta RS gets made then I'm sure it'll be great, I just hope they do it in RWD format ala Renault Clio V6 - FWD I think the ST would provide a better drive as there is only so much you can put through the front wheels in a small car. If so then I'd chose it all day long above the ST, if not then I'd go for the ST and a motorbike.
I'm waiting for the Focus Cosworth, but in the meantime I'm looking at the Clio 182 or the Civic Type-R.