car upgrades multiple questions

[docthory]

ok so i recently purchased from my friend 2 prs d3000spl amps a 1.5 F cap and 2 premier subs(haven't found out what ones they are ill be pulling one out of the box later this week to find out.) over the course of the summer i plan on doing multiple upgrades to my mustang along with the stereo system. some of these up grades include:

big 3

dual batteries

2nd cap

possibly 200amp alt

so to my questions

for the wire for the big three would 1/0 awg be ok or should i go bigger?

for the dual battery i was going to get a standard replacement for under the hood for now and then a second an xs power http://xspowerbatteries.com/xspma/catalog/product_info.php?cPath=29&products_id=75 in the trunk. with a 250 amp solenoid http://www.autozone.com/autozone/catalog/accessories/accProductDetails.jsp?subSubPartId=&itemIdentifier=196647_0_0_&brandName=Painless+Wiring&displayName=Solenoid+Kit+for+250+Amps+Dual+Battery+Current+Control+System&categoryNValue=100008&sortType=&store=1189&fromWhere=&fromString=search&itemId=prod62529&navValue=101428&skuDisplayName=Solenoid+Kit+for+250+Amps+Dual+Battery+Current+Control+System&filterByKeyWord=solenoid&productId=196647&appQuestionText=&categoryDisplayName=Performance&parentId=cat30102&subPartId=prod62529 to separate the two batteries

what size wire do i need for the run from the solenoid in the hood to the battery in the trunk.

and then the 200 amp alt yea? or neh? in general

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