I have a bunch of .410s and my favorite is a Browning Feather XS Sporting with 30" barrels. It is almost perfect, also discontinued, sometimes available around $2K. I have heard that Browning now has a Citori .410 with 32" barrels. 42s are nice, but I get tired of chasing those tiny hulls in the brush.

A good option if you can find it would be the Ruger Red Label 28ga in 28" with a set of the Ruger-labeled Briley .410 tubes. Gun is light enough that the tubes don't matter much, you get two gauges, and the Ruger tubes have 3" chambers.