Alpine speakers over MB Quart?
You must be crazy!
Have you heard the two side by side? There is no comparison. The Alpines do go lower in the mid-bass, at the cost of midrange detail.
If the Quart tweeter is too detailed(which I love), then a Dynaudio soft dome system will satisfy even the most critical phile.
JL amps are good, but they can't handle the load a good ole Linear Power or Phoenix Gold can.
I do agree on the Alpine head unit, but Eclipse are very nice and should be considered if the price is right.