Glenn
There is a difference of around $200, or $1800.I was going to go to Guitar Center to audition one but,instead I talked to the tech support guys,and bought direct. Bose will give you a 45 day riskfree trial period and will pay freight both ways if you don't think it is right for you. They want you to take it out to your jobs and try it.
As far as the sub is conscerned,my Z5500 sub is big,and the only way I could justify my Bose was to use my sub,which is only two months old.The only thing I know is that they recommend two subs for rock bands.They are powerful,but small and stackable.I wondered myself if I should have gotten one.
I might order one in and see.
Bernie