Good god that would be a rip off.... and the only decent thing in that list is the amp. I'd suggest a 10" or 12" SSA Gcon:
Sub Woofers - SoundSolutionsAudio - GCON - SSA STORE
A lower powered ~1000w mono-block:
Q1-1200D Amplifier
A custom enclosure for the subwoofer, likely to cost at least $150 after shipping.
You can find some decent components for around $100-$150.
And a good amp for the components under $200. Like a PPI Phanthom 900.4.
So now you're just under $1,000. And if you look for used deals on the amps, you can save another $200.
Get a Big 3 kit from either RAM, or AudioTechnix.... for around $30 iirc. Way better and cheaper than the stupid
Sonic Electronix one that was linked earlier.
Then, with that power, all you will need is an OFC 4 Gauge wiring kit, with a distribution block to go to each amp.
Now you're at around $1100.
I realize you still need to buy an HU and pay for install at this point.... but everything I've listed is of FAR better quality, and much more complete, and much more ideal for what you're looking for.
Also, I wouldn't go back to that audio shop again, those prices are absolutely laughable.
Lastly, if you're open-minding to a used head-unit, you can usually find them in terrific, if not mint, condition on here, for a fraction of their cost new. If you must go new, shop from
Sonic Electronix for that.