i have the rockford pbr300x4 right now and its great. if you pull the drivers side console floor panel there is a block of foam i cut out and the amp just sits there ever so nicely. the amp retails for like 270 and is nice but its not 2ohm stable and im swapping it for something else here shortly.
im not sure what happens to the upper screen when u install a new deck mine isnt in yet but if you found some literature on that please do share
and i wouldnt run more than 1500w on the stock alt which is 130amp mainly cause of the cars voltage controls. i did find out the ea alt will make a 200amp upgrade for 525 though and a voltage regulator for 130.
and i manged to fit a 36x17x10 box back there and maintain the majority of my trunk and thats roughly 2.5 cubes of space which is plenty for 2 tens of 2 space hungry twelve