Hey guys, ive seen many battery/alternator mods on here. What im wondering is, what do i need to run this:

-All stock components (electric everything)
-Aftermarket stereo cd player
-rockford fosgate amp, 150watts rmsx4ohm, ill have 2 speakers, wired to 2 ohms, so 150 each @ 2 ohms, 300rms total
-One of those 12v converters, to power an xbox
-one 7inch lcd screen

My alternator is currently the stock 90amp
brand new battery

if i have to do too much, im about to say screw the sub woofers, my alpine type-s door speakers/6x9's already sound amazing with enough bass however i do enjoy alot of bass, so yea just post like, if its safe to run all that, or how you'd do it, all ive wired is a small system in my old eclipse, this is going to be a bit different