I'm trying to decide, and I hope someone else can lend their expertise. For me, ABM500 Pro's: - Lighter, all in one, convenient, not embarrasing to show up to a blues gig with, and... sexy. ABM500 Con's: - May underpower the cabs I'm interested in (Bergantino's) Rack rig Pro's: -Much more watts for the money (Crest CA6 for ex.), never have worry about underpowering cabs, can try diff pre's later. Rack rig Con's: -Heavier, bulkier, embarrassing on small gigs and jams, need a rack, rack size will dwarf one or two 1x12s, noisier, more expensive, not sexy. I'm thinking of getting either two Bergantino HT112s, a HT322, or one of the NV cabs, depending on what my eventual requirements turn out to be. Thanks one and all!