Jason, have a look at the iStar objectives, they are very well made, come already mounted in the adjustable cell, and are cost effective.
http://www.istar-optical.com/achromatic-doublets.html
They offer regular Achromat lenses, and an Anastigmatic version with reduced CA. I used their 127mm f12 R30 in a refractor I built and it is a wonderful setup.
D&G, imho, tend to be more expensive than iStar and have limited production.