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Where are you looking such that you have the luxury of choice? Is there the choice of a 56/7/8?
There's lots of sites on the continent like Leboncoin and trocvelo which have lots of Looks and some are reasonably priced. Always negotiate. Some people really don't want to post to the UK, but if you offer to cover costs etc, they often warm to the idea. And lastly, always pay by PayPal goods/services so you've at least some protection. Or just pop over on a ferry and go for a day trip with cash. The ability to speak French helps greatly, as does google translate.
edit - I put a link for a 55cm one, but er, its just sold for £780. :-(
No idea. Personally I'd go small and go for long bits (seatpost, stem), but personal preference/aesthetic. Where are you looking such that you have the luxury of choice? Is there the choice of a 56/7/8?