First of all, take a look at the fit calculator
here, and make sure the frame geometry suits your body and the style you're after. Comfort being important, you probably don't want the more cramped 'competetive fit'. You'll probably find the more comfortable bike matches this fit more closely.
The 105 group set is good, and the price isn't bad either. List price for that is ~£1,200 in the UK. It's relatively heavy at 9kg though. Not sure if your BTW scheme allows you to purchase from abroad, but Canyon do some
great deals, similar or less money, better wheels, lighter.
Another thing to consider is that 2014 bikes will start appearing in September, so good deals could be had approaching that time as dealers clear 2013 stock.