Non-Bose Aftermarket Setup NEED ADVICE

[Carbon_z]

Hey Guys, so Ive already purchased a new headunit for my car "Sony XAV 70bt" and now looking at getting some other goodies. The amp is throwing me off because I do not want to spend tons on just an Amp but definitely dont want to get the worst of the bunch. This is what I'm picturing, let me know what you think.

Sony XAV 70BT headunit
Boston Acquestic SR60 Component Speakers
PowerBass 600x4 4 channel amp
12'' W3 2ohm

Im hoping I to have amp power the speakers and the sub together. Since I only have front speakers "like almost everyone " i figured bridging the remaining two to the w3 would be enough to reach the RMS on all speakers.

And Im assuming I will have to run 2 sets of RCA's on this as well, Correct?

I think the only thing Im basically going to get roasted on is the AMP but their new to me and honestly have never heard a thing about them.... Probably not a good thing but hey, thats why im posting this little note on this forum