hmmm, i was wondering the same thing, my limit is around 200 give or take
my system is currently audiobahn 1200watts for my 2 Jl 12w6v2
and an 800watts audiobahn for my speakers
i have crappy sony 6x9 but i wont upgrade them cuz i got them for free and i'm happy with them
so i'm wondeirng what would be the best component for that price range