I bought a CAAAAD Optimo whatever the number was as my second road bike. (It was an R1000 of the 04 vintage).

Full 6600, no mix and match. You can't even get new a full ultegra bike in the $1100 price range anymore that I'm aware of.

That said, it was a nice bike- all the welds were smoothed and had been filled but it didn't give me the happy ending that everyone seems to get after riding theirs.