The Specialized Secteur Elite would be fine for something like the Etape.
With your budget carbon frames are best avoided because you just end up with a cheap group set and wheels.
Have you tried riding a bike with the SRAM group set? The controls are quite different to Shimano and can take some getting used to!
Also worth a look are the new 2012 Focus range of bikes that Edinburgh Bike Coop have started to stock. The Variado 2.0 come with Shimano 105 and is only £899. With 15% off that would be a steal!
For any road bike being used in winter a set of SKS Race Blades (about £25 from Ribble) are excellent at keeping the worst of the road spray & grime off your bike (and your arse!).
Also budget for pedals, shoes and maybe shoe covers. You could use MTB SPDs but road specific pedals like SPD-SL, Look, etc are much more stable & efficient. I just bought a pair of Shimano RW-80 winter road shoes which are warm & waterproof after giving up with the neoprene shoe covers.