hey tehre im just slowly gathering thesystem i will be buying next april....i should be buying my deck and ipod interface tomorrow from MR2NR..he has been helping me out with the complicated world of car audio (Thanks :P ) anyways he has been recommending products to me i would just like more opinions

so far this is it
Deck: Eclipse CD3000 and IPC106 ipod interface
Sub

igital Designs DD2512 (i was battling over 2 10" or 1 12" looks as though one 12 wins so far)
Speakers: (2 or 4??) have yet to decide
Amp: (one or 2two) have yet to decide
Sub box: pre made or custom made and from whom
Installation will probably be local,but i am still deciding if i should put the speakers in the doors or mount them somewhere else.....
keep in mind i am looking for sound quality with some loudness for those days that i feel like balsting my music..i listen to heavy metal with some rock (hence alot of bass drum rolling , guitar solos..some bass guitar heavy stuff as
well)
opinions wanted