The Kenwood Excelon KDC- X597 isn't a decent head unit?????..I looked at the radios from $50.00 all the way up to over 200 just to see what you can get for the money.
Found a pioneer and a kenwood with 3 sets of pre outs @4v for 130 or less...the rest were 2v 2.5v and didn't have 3 sets of pre outs for less..The higher priced units had the same 4v and 3 sets of pre outs...figured I got the best I could find for the budget... $129.99 for the kenwood..$104 for the pioneer...Always been a kenwood fan and it puts out more power (22RMS per ch.x4) My thoughts were to use the radio to power dash speakers with 44RMS per side...a 4 channel to power the front and rear mains and an amp for the sub.
And some sound deadening for the doors/trunk/roof/some of the floor.
Did this with Microsoft paint as quick schematic of whats planned.
http://i1359.photobucket.com/albums/q793/Utherverse2014/proposedstereosystem_zpsdb3a70ad.png