Anyone w/ a 2010 that has the 440 watt JBL system?

[Matrix_Master_G]

My 2010 S AWD has the base single cd player six speakers one each door plus tweeters in two doors near side mirrors. Thinking of having dealer replace head unit with the 6 disc 440 watt JBL unit. Replace the four stock speakers in the doors with JBL's and put the JBL sub in the back. Whats your opinion of the 440 watt system. Any suggestions on what I could do myself to save money. When I crank the volume on the it gets to a point that says 'max volume' on the radio. It's not high enough for me, I listen to electronic dance