Probably a Sebenza, now that I have 2 other $500 knives in a MUDD and SHF, a Sebenza is certainly next in line to fill that void, unless I came across a Wayfarer in that range that I absolutely loved, or an older Winged Boye lockback. As it were, those 3 are on my list of next high end folders, Olamics I like (or a one off of my design) would be typically over $500 though, and BDS Winged Boye folders aren't readily available, and may or may not be over $500 depending on condition and handle material, so Sebenza it would be.