I am looking into purchasing an older razor to get started in shaving with a straight razor (I'm sick of buying replacement heads for the Mach 3). I read in a blog that Sheffield steel is the way to go. Do you guys agree, or should I look elsewhere?

I'm a college student with a wife, so I don't really have the money to purchase a nice, new razor. What should I look for when I purchase one in an antique store or online?

Thanks for any help, guys.