Ok, back to my "future" system:
Head Unit:
Alpine CDA-7893
Amps: Still thinking. My subs peak RMS is 300W (4 ohms) So I'd need a 2-channel amp with 300W x 2 channel (@ 4 ohms)? Does this sound right?
My Front speakers peak RMS is 45W (4 ohms). Need an amp with 45W x 2 channel (@ 4 ohms)?
Subs:
2 12" Infinity's
Door panel speakers:
4x6 Infinity Two-way plate speakers
Wiring kit: 4 gauge amp kit (as suggested earlier). Can I custom these or do I need to buy?
Cap: Again, any recommendations?
Sub box: I'm going to build my own
EDIT: also power and ground distribution blocks