I recently got a 585 (Mini-barrage) and I've taken a liking to it... I've also got a 940, which is awesome. It really depends on what you're going for, your lifestyle, and your typical uses:
940: thin, yet big blade. S30V steel, Drop point or reverse tanto. Can have the scales re-anodized and/or bead-blasted. Doesn't offer as much grip, especially when wet/oily
580: Bigger/thicker handles, fully customizable (Bladeshape,steel,colors,etc).
Check out the Griptilian too..