There's not THAT much gain going from 5600 to SRAM Force, and Rival is even closer to 5600.

So I say this

http://www.novemberbicycles.com/frameset/

plus a PowerTap from Psimet. And probabbly a better crankset/BB. BD tends to skimp there. Strip your current bike and put the parts onto the new frame. That gets you a great frame, and a PowerTap.

Keep the 50mm carbon clinchers. You can use the front at least with the PT.