I have spent about $1200,
Pioneer DEH-6850 H/U = 349
Response 6" splits = 110
Response 6.5" = 95
Response 2 x 150 = 200
Response 4 x 50 = 160
Pioneer 306c in box = 195
All wiring I got for free from work, but add some cost on for stuff like Fuse holder ect.
Noe: system isn't fully installed...