In my recent future I wish to install some rear speakers on my car. a component set of course.
I want to have them sitting at the back of my car facing straight forward towards the passengers.
with this new component set I will have 8 speakers in my car..


should I buy a 150RMS/4 channel amp? and (bridge?) my mids with the tweets on the front right, front left.. rear left and rear right?
or buy two amps and run each speaker from the amp.. Is this even possible.

If I bridge my mids and my tweets how do I run it through the crossover?

and should I be buying the exact same speakers in the front of my car or is it okay to change it a little bit.

One last thing.
I have a 4 guage connection for my subs and an 8 gauge connection for my component set, with this upgrade I'm going to need another 4 gauge wire, so should I run a 0 gauge and split it into 2 4 gauges? or just run another 4 gauge?