At our shop 6-8 hours would run you $540-$720. $90 per hour. Off the top of my head I would need to know what kind of car you have to give an accurate quote but basic breakdown would be $75 for the deck, $150 for the front components, $75 for rear speakers, $150 for the first amp, $50 for the second amp, plus any parts needed to do the job safely and properly (fuses, fuse holders, ring terminals, dash kit, wire harness, etc.)
So you would be looking at $500ish without knowing what kind of car you have plus parts. Expect to pay $400-$600+ at a quality shop. Ask to see credentials and pictures of previous installs to see what kind of work they do. For $500 from my shop all wire would be in loom and zip tied or clamped down where appropriate. System tuned properly (no loudness, gains not maxed, etc) Rings for the speakers routered and painted black to prevent water damage and so there isn't bare wood visable through the factory grills. $528 plus a harness and other needed parts on definately on par with what a shop should be charging for that job.
