Hows this sound?

id go 1/0 to distro block that puts out 4 gauge.

Peel n seal is usually in the midwestern states.

Ask them if they can either ship some to the store...or if they have a "like it" product.

If you cant get peel n seal go on ebay and get raamat, its still cheaper than dynamat by far, better too.

I would go with the HE2's they are a better match for your amps as well as a better sub. As far as the peel and seal goes don’t waste your money, I have used it and over time it will start to fall off. Not to mention it dose not deaden the sound as good as Dynamat or a similar product, if your going to do it do it rite. I would suggest that you look at a product called Brown Bread http://www.b-quiet.com/brownbread.html I have used this for a few years not instead of Dynamat, it is a fraction of the price and comparable in quality. Trust me its well worth the extra money not deal with the mess that the peal and seal will give you down the road. As far as your power goes I would suggest that you buy the components individually its more money but you will get proper equipment for your install. For the cables I would suggest that you go to Knuconceptz they have excellent quality cables at a reasonable price http://www.knukonceptz.com.  And I would use a 1/0 gauge for your main power cable and then branch off to the amps in 4 gauge. For fuse/distro blocks, connectors etc. I would suggest that you go to Darvex http://www.darvex.com/miva/merchant.mv