I fitted JBL 2 way and 3 way to my baby a couple of months ago. Got them from strathfield, think they cost about $320 and fitted them myself.
I got 5x7 directional 2 way for the front and 6x9 3 way replacing the original std ones which are 5x7 in the rear. The rear ones were a real shyte to fit, front ones bolted straight in.
I'd pay the extra if you go with these and get them fitted (thats assuming you go with the larger ones in the rear.)
I am absolutely wrapped with the sound. I had planned to put a subby in as well but since I fitted these there is no need. When the kids have them pumping (ok maybe its me as well with AC/DC) the rear view mirror pumps with the bass beat.
BTW, my original rears got fried by my other (better?) half, not sure what she was pumping! Should have claimed them under warranty but I wanted to upgrade anyway.