http://www.mobileelectronics.com.au/...onents_review/

Speakers are all a matter of personal opinion. If they sound good to you, bobs your uncle.
But, some splits up front, keep stock rears. You don't need to up the rears. A good analogy used by the guys is 'When you go to see a band, where does the sound come from? Infront of you, yeah? As in cars, a good soundstage is one that makes it sound like the band is playing on your bonnet'
So basically, forget the rears, get a good set of front splits, get an amp if you want (if not, some efficient splits will sound good off your headunit. amp can/ usually does make your speakers sound better) Make sure the speakers are installed properly/ securely, invest in some dynamat if you can. It'll help with the speakers sound.

If you want an amp, aim for either a 4chan that can bridge 1/2 and 3/4, then bridge the channels and have one bridge each side. OR, just channel 1 and 2 to the fronts, and save 3/4 for a sub later down the track (if you want)

As SQXPRT said, hit up marty at FHRX, he'll sort you out. Although, he doesn't install speakers without dynamat (which is good, and his services are WELL worth it) which costs a little extra than your average drop in install. But as said, he is well worth it for installs. He is also a great guy to talk to about DIY, if you want to attempt it yourself, and he will help you pick speakers and what not. Top guy in the car audio sales industry.