jack says: Keep some cash and buy used. You can find some good used ArcAudio, McIntosh, etc....
Same for HU,,,someone is selling a Pioneer P9 combo somewhere, or a Sony C90 with 4000X processor.

Only new should be the Lambda Acoustics sub, and maybe the drivers.

If you want realistic sound, check my stuff:
clicky
Main recommendation is the ScanSpeak 18W/5535A midbass.-


He's chaaarging!!!...(add scottish accent)... My audio setup is here: www.cardomain.com/id/contoursesport