Brother Tallships,I've used my Slim since '61 and always get great shaves from it also have the Super Adjustable since the 70's, that is another great shaver and lately I inherited my fathers Fatboy I really like. Comparing the Slim and Fatboy, I like them both. The Fatboy has a thicker handle and different head trajectory than the Slim, causing a slight change in angle and technique when shaving. The Super Adjustable or Black Beauty has the same head as the Slim but longer handle. All three are great shavers.
I get my vintage razors in yard sales thrift shops and antique stores, rarely paying over $10 for a razor, usually $3-4.
The sourcing and pricing of your razors is interesting. How many are in your collection? And do you have any unusual razors?