The altitude of a pass is not the biggest thing in difficulty- it is how many feet elevation gain per horizontal distance. I think Taboose Pass in the Sierra will compete with any Colorado pass. I used to climb in the Cascades in Washington- then moved to the Rockies - and encountered "Colorado 14'er snobbery". Everyone poo-pooed my Cascade climbs - as ONLY 9,000 feet - well that is a lot when you start at sea level! I would also say that climbing Mt Rainier is no shabby thing - either for absolute altitude or elevation gain.