I've disliked, or rather been non-plussed with, Colnago's 80's and 90's colors for quite some time. Most likely I was jaded by the silly top tube rider or their odd fades and color combos. Whatever they got wrong on their classic road bikes, however, they got totally right on their mtb offerings.
The Master Ibex is now something that I'm going down the rabbit whole with. They can be had for good prices (the latest Monte Amiata frame is listed for $1700) if you know where to look, and come in a variety of tubing configurations (toss in a Gilco tube somewhere in the main triangle or even find an alloy version). So long as it's post U-brake (so, 1988 and on), I think I have a winner. I mean, just look at those gaudy colors!
I've read that the Master mtb frames are heavy as can be. No worry, so was the Record OR group! Also, scroll down far enough and you'll see the shoes that MUST be worn with it!