I've ordered Michelin Pilot Sport 4Ss all round (£980 black circles) and they are being fitted on Thursday next week. The fronts are the same size as stock, the rears are slightly wider at 295 as 285s aren't available yet (US forum reports no rubbing problems). I'll let you know how I get on. My Corsas are still mostly OK after 14k miles, the outer edges on the fronts are pretty much gone and the rears are around 1mm from the wear indicators, that's after 14,000 miles. Not bad.
I know I'm a scratched record on the subject but most of the QVs on here arrived after the weather improved and you haven't experienced the terror of cold Corsas. January and February were no fun and I would strongly advise no-one to take on a British winter on the Corsas. At best it will be no fun, at worst... well you know what the worst can be. I don't believe in winter tyres in England (recent marketing exercise), but "extreme summers" are a no-go so a year-round tyre like the pilot sport should be a winner.