Don't rule out the Planet X Nanolight Hi-Mod. In recent years, I've had a Litespeed titanium, and an S-Works Roubaix and they've been excellent frames, but I must say, my current PX is a really superb bike, and that's not factoring into account it being a fraction of the price of the other two.
I have no experience whatsoever of SRAM road kit, but this for £1500 is a blooming steal if you ask me.
Mine's built with Dura Ace 7800, Pro bars, stem & post, Ksyrium Elites, and FSA carbon cranks and comes in at well under 17lbs... and it rides like a dream. I genuinely highly recommend you at least swing a leg over one!