I also wear the REI convertibles and like them a lot. The Columbia and Ex-Officio look good also. The Ex-officio have a built in mesh underwear, I believe. TNF convertibles may be good for winter, but seem a little heavier.

If you don't find what you want from EMS. You can order a pair from REI. They have a 100% satisfaction guarantee. So they are easy to send back. Probably cheaper to pay shipping than buy gas to drive to a store.