The Madone SL frameset is a great frameset and the 5.2 a nicely spec'ed
bike. You could also look at some of the Specialized bikes (Roubioux,
Tarmac), also Orbea Onix or Orca, or some of the European superbikes
like the Looks, Time, Merkx etc. I know there are also two version of
the Scott frames, the Team version which is super expensive and the a
"limited" version that is slightly heaver (going form 810 to 890 grams
I think, so still super lite) that is spec'ed with Ultegra and much
more reasonably priced.