As they say, "the wrench is only as good as the nut on the end of the handle." I think a very good bootfitter will make you a good footbed, using whatever materials and system he/she likes to work with.
That said, the best footbeds I have ever had are the Superfeet Corks, molded to an unweighted foot with a vacuum-bag system. They have very deep heel pockets, which are important in stabilizing your foot--although once again, the position they stabilize your foot IN is critical. They are also good for someone with flexible feet that tend to pronate, like me (and it sounds like you too). And they will last a VERY long time--mine are nearly 20 years old!
There are other unweighted systems out there that can also be very good. "Instaprint," as used by Bob Gleason and his Masterfit University boot fitters, is a good system, if expertly applied.
I like Surefoot as a company. I like the way they do business, and their genuine devotion to excellent customer service. But I am not sold on their footbeds. The computer imprint is "neat" and colorful, and has the advantage that they can make you another pair at any Surefoot shop anywhere. But I don't think the footbeds they make are substantial enough for someone with feet like mine, and being a weighted system (you stand on their computer-platform), I think you will sacrifice some of the "neutral" support of an unweighted system.