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Sometime in the mid-nineties they renamed the Colorado to CSi, possibly because at that point steel became less prominent in their line-up and they didn't want to brand Colorado tubing, which came to encompass Ti and carbon, as exclusively steel.
At the same time, there was the Atlanta, a step below the CSi in terms of tubing, and that evolved into the Colorado III in 2001, which was closer to the CSi (triple-butted main triangle), but without lugs and fewer paint options. The Colorado III was rebranded CIII in the mid-aughts.
nohwol
^That is pretty much the twin of my CSi:
Which is lugged, has the swaged down and seat tubes, head-ons, Serotta branded carbon fork with a threaded 853 steerer.
I didn't think that the Colorado was produced in parallel?
You can see that my Colorado CR has most of the same features, but it has shifter bosses on the downtube due to being from the period when downtube shifters were still commonly used:
Which is (I believe) as it was the precursor to the CSi.
The Colorado on eBay has the features of a 2,000+ CSi, I think.