When these were the new models in 2001, the CLC 5000 retailed for 89,500 as a high-end color machine and the CLC 3100 retailed for $63,100 aimed at 'entry-level production environments'
The CLC 5000 and 3900 feature 800 x 400 enhanced resolution, while the CLC 3100 prints at only 400 x 400. A lot of the enhanced resolutions are difficult to notice, but this step was quite visible in the output quality to discerning eyes.