Advice on new bike £1200-£1400

Hi,

I’m looking to upgrade, spending around £1200-£1400, ideally spec I’m after is as follows:

-Carbon Frame (Decent frame that will be worth upgrading components in the future)
-Di2 compatible/ready (see above)
-Available from the lbs

So far the Tarmac SL4 is jumping out, seems to be the same frame as the more expensive version with scaled down components.

http://www.wheelies.co.uk/p65868/Specialized-Tarmac-SL4-2014-Road-Bike.aspx

but, would it be worth trying to push to the Sport at £1400, is there much of a difference?

http://www.wheelies.co.uk/p65873/Specialized-Tarmac-SL4-Sport-2014-Road-Bike.aspx

Alternatively, (and more importantly!) are there any other bikes that fit the bill that really stand out in this price bracket?

Cheers!