Hi Asymetric,
Welcome to SRP!
whether you buy antique or new is really only a matter of taste.
I personally knew i was always going to have more than one razor because I read that a razor has to rest 24 hrs while the "fin" hardens after being in contact with water.I also wanted to learn the art of honing razors so I wouldn't have to send them away.Remember nearly all old razors have dings and chips in the blade and need repairing.
I wanted a vintage razor around 150 years old knowing that it had been owned and used by men who had never seen electric shavers.(Also because Neil Miller says that the steel used at that time was better quality than modern steel.)Because of this all my razors are over 50 years old.I have six.
Despite the above ,I realse there are good modern razors out there and you could find very good razors both antique and new on this site in the classifieds and on SRD.
All the above is in my humble opinion.
Happy shaving!
Kind regards
Noggs