I would go directly for an amiga 3000 SCSI with hively tracker and eagleplayer (you got to spend some time to configure, but then it's astonishing great!)
Then if u want even better powerful sound than paula (you heard it! it's powerful.) go get any 16/24 bits Amiga Card - They are diamonds of hardware, even nowadays.
If you're in my position - a4000 owner (1200 its pretty the same), youll find that youll need a VERY EXPENSIVE scandoubler. So... you may try linux'soundtracker. It's not the same thing - lot's worst than hively tracker, but it's not emulated...
You can hear i do with soundtracker-linux (1st 2 songs) - they are just 100kb each one...
2 sound modules