I sailed Ranger 20''s for 5 years before moving up. Wonderful boats. You will find it hard to beat the combination of design details and good handling...
Having said that, the only Crown I am familiar with is the Crown 34. This was a strong cruiser/racer within IOR design parameters.
If you are looking for the strong construction of the R-20 and lots of speed in a cruising interior, consider an Olson 911S. I have an Olson 34 built by Ericson. Quite a few O911S'' were built by Pacific Boats before Ericson bought the tooling in the late 80''s. Good boats and they have the agile feel you take for granted in your Ranger...
Loren in Portland, OR
(former owner of R-20 #182, 456, and 500)