I have a Ross Colorado Co-0 on my Sage 279LL and a Ross Gunnison G-1 on my Sage 379LL and Sage 389VPS-light. I can see why you like the Ross Colorado! My daughter has a Redington 2/3 CT Reel with her Sage 386DS2. I'd highly recommend these reels but they are no longer produced.

I know of a place that has the Lamson Velocity Hybrid Large Arbor Reel RL V01Y WF3/40 yds #20 backing wt 4.00 oz dia. 2.85 reg $219 on sale for $129.95. Or take a look at this guy's products at http://www.flyfishingbenefactors.com. They seem very reasonably priced. But I've never seen them first hand. Good-luck!