New Guy with another which one of these bikes threads, 3K spend

Hi all

Im a new to the forum and new to taking road riding serious, I do a lot of MTB XC but have been doing a lot more road riding recently on my decathlon Triban 3 but now I want something a little more suited to beating my mates and getting up the STRAVA leader board 🙂 the only thing is I don’t really know much about road bikes!

That said I have decided (based on what friends have and say) I need a carbon sub 8Kg bike with Udi2 and decent wheels, I have a 3k max budget and im looking for a decent bike that’s great VFM, im happy with 2nd hand, ex demo, 2012 spec

This is my short list to date…

Felt AR3 Di2 __ 7.89kg __ MAVIC Cosmic Elite __ £2700
[url=http://www.bike-discount.de/shop/k974/a59257/ar3-matte-carbon-monster-green.html?lg=en&country=226&cr=GBP]LINK[/url]

Ultimate CF SLX Di2 __ 7.05kg __ Ksyrium Elites __ £2900
[url=http://www.canyon.com/_en/roadbikes/bike.html?b=3090]LINK[/url]

Cannondale supersix di2 __ NAkg __ Ksyrium Elites __ £2400
[url=http://www.paulscycles.co.uk/m7b0s6p4329/CANNONDALE-SUPERSIX-ULTEGRA-DI2-%282012%29]LINK[/url]

Colnago CLX 3.0 Di2 __ NAkg __ Shimano WH-RS30A __ £2899
[url=http://www.chainreactioncycles.com/Models.aspx?ModelID=70270]LINK[/url]

Vitus Vitesse VRi Di2 __ NAkg __ Ksyrium Elites __ £2519
[url=http://www.chainreactioncycles.com/Models.aspx?ModelID=81022]LINK[/url]

Fuji SST 2.0 Di2 __ 7.7kg __ DT swiss Oval 535 __ £2319
[url=http://www.chainreactioncycles.com/Models.aspx?ModelID=93940]LINK[/url]

if you where me which would you choose and why ?
Are there any lemons and why ?

note: Im 5.7′ 72kg ive been riding up to 50 miles a session at the moment but want to double that (I did 80 at the weekend on my £300 Triban 3) for longer rides but still want something focused for shorter sprints.

cheers in advance