I can tell you some that aren't the best choice
Comfortwise the Pearl Izumi Gel-vent Pro is great but is not suitable because the leather falls apart about the third time they get soaked or laundered.
The inexpensive lycra backed gel glove from performance is cheap, but less comfortable. It held up fairly well on a recent TransAmerica. The lycra was shot after 4300 mile though, while the palms were still fine.
My daughter has been using some gloves from specialized. The design is good comfortwise and they seem to be holding up well, but it too early to tell with maybe 2000 miles on them.
A touring friend we met on the road was having excellent results from a pair of specialized gloves that were a touring specific model, but he said they were no longer in production.
If someone doesn't come up with a better solution I plan to try one of the models from Specialized next.