Actually, there's a new one since that picture was taken, with brass bolster, Koa wood handle, and BG-42 blade! I just ordered one for my son, as a present for his Eagle Court of Honor, which will have a damascus blade, cherrywood handles, and Nickle Silver bolsters. Can't wait to see it!
Regarding which one to carry, it rotates, but I have some favorites. The Koa is a current favorite, as is the damascus/oak. Buck's damascus is not the most beautifully patterned I've ever seen, but it's made a great steel to use. Today, for some reason, I picked up the buffalo horn/damascus.
My only problem is I can't bring myself to carry the 532's. The sheath is a little large for the size of the knife, and I hate to put them in my pocket and get them all dinged up. I need to find a couple soft leather cases I can slip in my pocket.