Rapha, nice but a bit pricey?

I'm not trying to nitpick, but I will. Out of your post I found that;

Castelli - only really is found on ebay, but any new stuff is north of £100.
Gonzo - nada
Swabo - is not easy to find, but when you do it too seems to be c.£100.

Other brands I found were:

All-City - $120USD.
On-One - £30-40
Endura - £40-60

So it seems that the "decent brands" cost the same with a bit of a Rapha premium. That said your post was useful for finding some nice old school Castelli, so thank you.

Some other ones I found:
Vulpine
Le Coq Sportif
Nitto

Nice but pricey