Hi, i'm thinking of dropping my wt550 plans and going all out with an aguilar db659 pre. i want to run a 4ohm 410, i plan on getting an epifani ul. i'm in australia and aguilar is sooooooo expensive out here. that pre retails at $2900aus!! i'm going to get that online but i want to get a poweramp locally, and my options look like mackie1400 yamaha p3500s or crown? i've read lots of good things about the mackie on here(apart from weight) and a little bad about reliability. does anyone have any experience with the yamaha?? Thanks!