Wow – how long's a piece of string etc? 😉
Flat out racing roadie on a budget – Boardman or Planet X (with change to spare from both!)
Touring roadie – plenty of choice that I'm not really qualified to suggest.
Sportive (or middle aged!) roadie – Specialized Roubaix (if you can stretch to it) or the cheaper Secteur.
I can recommend the Roubaix from personal experience, but there's so much choice. The big brands (Giant, Trek, Specialized) don't get much wrong these days and all offer racing bikes and sportive bikes – the difference being more comfortable and compact geometry on the latter with typically higher headtubes, but don't discount the likes of Ribble, Planet X and the like as some of the complete bike deals they do are incredible.
Planet X have a new showroom too, so it gives you the chance to try for size. I guess you're going to have to try a few first but have an idea of the sort of riding you want to do beforehand and that'll help you thin down the candidates. Hope that helps a litte…? Just my 10cents of course and I've probably missed a few obvious one out too, for which I apologise in advance. 8)