Great review...really helped. I had HK in my e46 M3 and spent probably just short of the $1900 mark upgrading that to a better standard and losing 1/3 of my trunk space on amps and speakers/subs in the process and definately would avoid going thru that again. I think I'll skip some Starbucks or sell my set of exta 18" Carrera wheels in my garage to make up the difference and go with the $1900 premium audio..esp since my ipod Touch and I are best friends in my car most of the time when I am driving IF Sat radio is not avail.
'12 F10 550i (Dinan Stage 5/Intercoolers, CF Intake, Brace, Shockware, H&R Springs, Eisenmann Race Exhaust, CF rear difuser, Giovanni "Lindo" Graphite 20")
'10 e71 X6 35iDrive SAV (Space Gray) - Gone
'06 e85 Z4 M Roadster (Black Metallic) -Gone
'08 e92 M3 coupe (Sparkling Graphite) -Gone