Four fence companies and various opinions. Based on this thread and how we weighed what the four companies said, we are going with the cypress and with only the gate posts concreted.
Supposedly cypress holds up a bit better -- considering warping, durability, etc. The company we chose said that posts tend to get brittle of the years and as they move slightly they could break. The gate posts need the concrete for stability and will have steel bracing. One company gave a discount for cash -- made them competitive, but was a turn-off to people who had taxes deducted from our salaries.