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40-50htz? You don't want to listen to the annoying punchy shit you dumbass. That's for "hood shit". You want to be able to FEEL the notes as they are being played. Kind of like your home surround sound. You're subwoofer isn't tuned at 30+htz. It's around 24-26. So you can hear and but more feel it. Everytime people call me retarded for having something at 20 htz. Let me tell you. My 4 15''s at 20 htz would break your windows.
the DD wit nav is gonna eat up most of your budget man, you might just have to settle for a DD without nav, unless you go with an off-brand unit
I'm a pioneer fanboy. Check out the Avic X930BT, hell right now you can find a 920 for cheap. about 600.
Subs: cant lose with Kicker, JL, RF...
but a lot depends on what type of music and how you listen to it. go to a shop and **** around with what they have. let your ears tell you what you like...not us