You could buy just about any knife from those makers and if you find you didnt like them, probably would have no problem selling them, especially the RJ Martin folders.
I would love to have a Terzuola ATCF in my collection, but the price puts it outa my budget.
I have a Lightfoot LCC which I am very pleased with. I also like his older Warhead folder. Greg makes a bulletproof folder and is a darned nice guy as well who took time off his busy pre-blade schedule to fix my LCC which I bought in pretty dire condition from another collector for no extra charge other than shipping.
My RJ martin Kozuka is my favourite neck knife - single grind A2 and sharp as only RJ can do them - he justly deserves the praise for delivering some of the most frightening edges on blades.
If you are looking for other makers, I can wholeheartedly recommend Kit Carson's Model 4 and Model 16 and Mike Obenauf's Model 2.
Andrew Lim