Research for upcoming system

Im resolving my car troubles and starting to look around for the components to my system. this is what im looking at so far.

Headunit:High End kenwood, its my friends and he didnt want to put it in his new 05 mazda 3 so hes selling it to me for 150$

fronts: focal/BA/Re components

rears: "

sub: XXX18

amps: front and rear off of HU for now and a
Hifonics BX2005D (http://www.ikesound.com/product-product_id/3444)

im not bothering with soud deading cuz the car im looking at getting is a rattle trap so it wouldnt be worth the money i would need to invest.

now im not sure about the amp, i know hifonics is a decent brand, but what are some others? im looking @ <400$ the BX2005D is 330$.

and my biggest question, what kind of box? what size? ported? sealed? bandpass?

from what ive read and researched i thinking about a 8-10 CUFT w/ somewhere around 140sqin port area @ 29HZ. this is a daily river but i want it as loud as i can get.

if i port the box im going to lose the upper bass freqs right? [80-50 ish]

also how would i go about make the ports? im assuming something that big would be a slot not circle.

also what would yall recommend for car security, i do not want all this shit jacked, im thinking about bolting my box into the car. but any good/bad expreicnes with car alarms? any brands to watch out for?

well i aprecaite any and all help/advice/critisms/ just dont flame, this IS my first real system and i want to do it right the first time.

again thanks in advance for yalls help