I can honestly say that in my experience, and in terms of return on investment, no maker has come close to the value offered by Jerry Hossom.
My criteria may be a little different than some, but Jerry's willingness--even eagerness--to get the buyer involved in the design process is without equal, and is paramount in what I look for from a maker. He is first and foremost interested in making a knife tailored to the individual buyer's needs and wants.
That said, he also uses the very best materials, has probably the most ergonomic handle designs, offers some of the sharpest, strongest edge bevels available, and can balance and lighten a big blade better than anyone I've found.
I've traded for his knives in the secondary market, and have been happy to offer more value on trade, knife for knife, than his original asking price represented. You very rarely see one of his blades on the exchange forums, and when you do, it doesn't last long.
In short, based on value-to-investment ratio, he's the best I've found.
--Will