Hey man I also have a ZX3. As far as coaxials I put a set of Infinity 6802CF and they sound damn good for the price I paid them. You can grab them off ebay for really cheap. JL Audio are pretty expensive and I don't know if they're worth the extra money.
honestly what I did was put 6.5 Components in the front doors. Mount the tweeter right beside the mid bass. (I would go with the Infinity Kappa Perfect 6.1) I threw a pair of those Infinity 6802's in the rear for filler. I have a 4 channel amp running those 4 speakers (JL Audio 300/4 75watts RMS / channel). I have a JL Audio 10W7 in the hatch with a JL Audio 500/1 running it. Sounds amazingly clear.