In 1985 I bought a Ritchey Commando. I love the slack geometry. Over the years I've replaced every part except the left crank arm and the Deore cantilever brakes. I think I'm the only guy in Oregon with a '70's vintage Campy Record (steel) headset on a mountain bike. Rear derailleur is a '90's vintage short cage XT. Front der and crank are Suntour XC Micro Drive. Hub's are mid '80's XT. Shifters too.
Did I save money? Probably, because I worked in a shop and bought closeouts. For example, I bought the only right crank arm with rings. That's why I'm still using a 24 year old left arm.