Kevin:  Thank you so much for the info regarding the sawbuilder guy.  I'm looking to get a 572 built, and I'll definitely bear him in mind.  West Coast Saw builds ridiculous monsters, but he wants an arm and a leg like Jack (hotsaws101).
Mick:  The first Husq. 540t auto-tunes were some of the wretchedest saws a man could ever hope to waste $800.00 on.  Having said that...  Stihl generally pirates all of Husqvarna's air-flow tech, Husqvarnas have way better ergonomics for PNW long-bar set-ups, and Husqvarna designs generally place the weight of the motor much closer to the operator's body, thus saving-out the operator's back with their more streamline designs (the 390's a bit boxy) than their much boxier Stihl counterparts.