I don't have a 60d, but have had plenty of its brothers, I use eval almost exclusively and either dial in EC, use a manual setting or exp lock when the metering will be thrown wildly.
For your question, loads of setting up time and little opportunity of checking/adjusting, I'd use Manual, set the exposure on a plane on the ground (in the same light), you're good to go. The only caveat, you need to be able to instinctively see the subtle light level changes, moving cloud etc.