Picked up my 1957 Crown with 1953 Ektar 127/4.7 some years back for a couple hundred dollars. Is quite clean with no serious flaws. I think SGs are being jacked up in price due to the whole Aero-Ektar thing - which is of course yet another "you'll never need anything else!" rathole for people to get wrapped up in.

I've personally never had a need for anything other than a Crown. Lighter too.