u probably had a decent component speakers, sub.. have u thought of having a decent headunit? HU is also vital 4 a good sq setup.. for the rear, maybe can still do with the stock speakers, if u still have them.. IMO, component speakers for rear is deemed unnecessary..
there can b many combination of amps for your setup..
1 2-channel for front, 1 2-channel bridged 4 sub
1 4-channel for front, sub
1 4-channel for front, rear, 1 2-channel bridged for sub
1 5-channel for front, rear, & sub
or can have a monoblock 4 sub only
& etc etc, which could crack your head.. :D
visit some nice, good installer, get some advise from them, no obligation to purchase.. & most importantly how much is your $$ limit.. :cool: