2005 Trail Blazer, Spec out needs for Power upgrades of small audio system

[smullen]

So, been out of Car Audio for a bit, been wanting to put another small system in, every time something seems to come up.. So I'm trying again...

Vehicle: 2005 Chevy Trail Blazer

So far I have the following...

Pioneer Head unit,

Polk Separates in all 4 doors.

Parts I have acquired:

Sundown 2000D (these Sundowns are are few years old But BNIB) (Needs 200 Amp Ext Fuse)

Sundown 125.4 (fuse 30x2)

15" FI BTL (Same with the FI Sub, BNIB)

I would like to figure out what all exactly I need to do get and do so the two Amps have plenty of power. No Blinking lights, or any power problems...

I was thinking,

Update front Batt (not sure what)

Mechman Alt (not sure which one)

Big 3

Two Fused Runs of 0/1 to rear

1 or More Batts (the less room the better)

Some kinda Distro/Buss Bar setup to connect the two amps...

I don't really see adding more amps or devices to this system for the foreseeable future

I can wire stuff up, but I have Zero box building skills, so unless someone has other recommendations, I'm thinking about a Pre-made Fatboxusa Box...

http://www.fatboxusa.com/products/1-mdf-15-fi-audio-btl-subwoofer-sub-enclosure-box.html

I know most folks here frown on pre-made Enclosures, but I'm not looking at doing car shows, comps or to show off, I just want a fairly banging system, without going in 20K....

In a year or so, when I get a lot more credit cards paid off, I'd like to re-do a much bigger system in a secondary vehicle...