since you are already planning an upgrade, i'd just get either kicker hyperflex 0 gauge or knu fleks 0 gauge. the cadence wire could hold one 1500 and 80.4 but not a second, you'd definitely need to make a second run with the cadence (not a bad idea for a second run no matter what wire you get). if you do get the second 1500 you'll either need a good AGM battery up front with a second in the rear or a good AGM battery in the front with a moderate increase in alternator size (maybe 200-250a). either one of those routes will need a 0 gauge big 3 (that should already be in the plans if not already done in 0 gauge). me, personally, i'd just get the 80.4 with a cadence or kicker 0 gauge dual amp kit w/big 3 upgrade and complete the system.
