One other thing to consider, depending on the amount of DDW passagemaking: To get the foresail 90 degrees from the course requires not only a (very) long pole, but long sheets. Such a set is useful in light air, but has to be revised as the breeze comes up--and the pole has to be shortened as you furl the genoa. Hence the attraction of the Forespar "line control" whisker poles, which can e adjusted in place. (Extending and retracting a conventional "button" pole can be awkward, and may mean derigging from the mast every time).
A very long pole is also useful in conditions in which the sail is set more than 90 degrees, that is, the clew is actually forward of the bow. There are days in which the light wind or sea conditions (a quartering sea), and the needs of a steering vane, encourage that. Again, long sheets are required, with the upside being that a long lazy sheet works well for the pole downhaul.
A too-short pole is no fun, as the foresail wants to be a big barn door in light air. But great length is asking a lot of a telescoping pole, and as a result I'm not a fan of carbon fiber and would stick to aluminum, or at least half-aluminum, and the recommended pole diameter.
This is getting picky and frou-frou, and only really applies to the Hawaii run, or any long voyage dead downwind.