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50cm
I know the saddle/seatpost thing is being dead picky, but its one of those things where a voice inside my head says "well, if you spend 100 quid more on this one its got this and this and this..." The Arione thing is only because its my saddle.
I've always loved the supersix frames, and ever since I've toyed with buying a new bike I never thought I'd consider anything else. Grouppo wise I'm not fussed, I've only ever used Campag (and Mirage at that) and bearing in mind how clunky my gears are at the moment anything is an improvement. My only affinity to Sram is I like the shape of the hoods.
Racing is £1349 and Ultegra £1299. For the frame and spec I think they're both excellent. Saddle and seatpost are an easy sell and swap. I have a carbon C2 seatpost for sale if you want, off the Ultegra model. Which size frame?