You can get a decent idea of what is out there via ...
www.calhouncyclery.com
They are known for have an excellent selection of tires. The recumbent guys have also talked about a Panaracer 32-351 tire (from memory) in a positive manner.
Personally, I would try out the Primo Comets -- great tire at the price, IMO -- before switching to 406. The Primo Comet also comes in several widths including the widest 451 tire that I know of ... 37 mm.