Not really sure why I never contributed to this thread when it was new, but I doubt that my current choices would have differed much from then anyway.
For what it's worth, and in no order of merit, I'd choose:
The Teardrop Explodes
Echo and the Bunnymen (first five albums only)
Magazine
Joy Division
Ultravox! (Foxx era only)
Siouxsie and the Banshees
Public Image Limited (Levine era only)
XTC
Adam and the Ants (up to 'Kings' only)
The Fall
I don't think Japan qualify, as they were far from anything I'd describe as "post-punk" up until 1980 or so. However, from that point...way hey.