Just in case any Klein fans haven't seen this:

MyHistoryOfKleinRoadBikes

Performance model was offered with at various times with Victory, Ultegra, or Chorus or DuraAce.

My Quantum Pro is still my best bike and main ride at 21 years old and I have hardly any motivation to get something newer.

Built it up from a bare, unused frame: 1998 model in 2003, picked every single component... replaced almost all of them since then too.