My all time favorites so far: Don Hanson III, Bruce Bump, Ray Richards, Nick Wheeler, and John White.
I honestly find myself more inspired by these contemporary makers rather than legendary historical makers (though several on this list will eventually find their names listed among the greats).
Don Hanson's work just flat out catches my eye. I can scroll through pages and pages of knives quickly without looking at names, and every single knife on the page made by Don makes me stop and look. His ability to put flow into a knife that almost speaks an emotion is uncanny. I can recognize a Don Hanson III creation better (for whatever reason) than just about any other maker's work because of the emotion it stirs in me.
Bruce has skills in many areas, and his creations take my breath away. I love his cut-and-shoots and his ability to make intricate assemblies seem easy. Ray is another master of flow, as is Nick Wheeler, and Ray's style is right up my alley. Nick's attention to detail borders on obsessive, but it makes the difference when you hold his work. John also has a style that speaks to me with great lines and amazing bowies.
Your favorite makers will be dictated by the style you like best. There are hundreds of top notch makers that don't make my short list, but that is only because of stylistic preference. The skills possessed by some of the art-knife makers are probably unrivaled, but for whatever reason, I'm not drawn to all of their work. And there are hundreds of other makers who's work I've never seen that could probably make my list as well.
If you want to explore some of the best makers out there in a variety of styles captured in amazing clarity, check out the following link. Happy gazing:
http://www.bladeforums.com/forums/showthread.php/612884-SharpByCoop-•-Gallery-of-Handmade-Knives
--nathan