I think Rohloff is way out of my budget. I've also heard some bad things about Alfine 11, so most likely what I am looking for is something with Alfine 8. I have no idea what are "vintage SA 3 or 5 speed" :)
Sturmey Archer. You can still find vintage ones out there (they do last after all), as well as Torpedo ones (pre SRAM), but the Alfine 8 is the one you should be looking for if you are after an OTP.
A belt drive would be a logical pairing IMHO.
I think Rohloff is way out of my budget. I've also heard some bad things about Alfine 11, so most likely what I am looking for is something with Alfine 8. I have no idea what are "vintage SA 3 or 5 speed" :)