No offense but I would not compare the quality of the jl amp power and Pheonix Gold. I am saying this from personal experience. I promise if you go into a shop and get them to demo the 500/1 on either 12w7 or 10w7 it will be the shizl.
Again this is my own opinion.
Stereos are like everything else. It comes down to personal opinion. What I like you may not like, what I think sounds great you may think is not enough bass/too much bass. Just go and listen to the stuff yourself at a stereo store that you can trust. Go to several and see what they all say. DEMO,DEMO,DEMO. Research, Research, Research.
As Long as you like the stereo that is all that matters.
By the way check out the w6v2 ProWedge Systems, and W7 ProWedge Systems. I know where you can get a JL 10w7 with the box for 500. Let me know if you are interested.