Lots of great vintage razors out there. I think the true "must haves" are the ones that have personal meaning or significance to you. Your Grandpa's razor. Your birthyear razor (or your dad's). A Slim for the James Bond fan. A Fatboy for the Harley guy. Stuff like that.
This is where I have ended up. Starting with razors everyone else recommended left me with a stockpile of razors I won't use. After someone remarked that I must have a room that looks like a shave museum, I began to pair down the razors to:
- Parental Birth Razors('47-'48)
- Grandparent Birth Razors('10's)
- Goodwill-I settled on 162, 164, Try them all and decide
- Gillette Open Comb TTO-Aristocrat, Sheraton, and/or Senator
- Fatboy and/or Slim
- Safety Bar TTO-Be careful, the list is already getting out of hand...
- WWI Razor-Remember
- WWII Razor-Never Forget
- NEW-LC, SC, and/or DeLuxe
- New Improved-Those Art Deco Handles
- At Least One Premium Set
- Something Boxed that you particularly favor
- A Double Ring-This is where the shave world began
- Auto-Strop
- Lather Catcher
- MMOC
- MMCP