The link to the FD that you posted is for a Canon mount.
The older lenses will fit your camera as long as the lens is an F-mount and Ai or Ai-s. Non-Ai will have to be converted to fit the DSLR. Of course, everything is manual including exposure. . . you'll have to set it "the old fashioned way"
You could probably get a 50mm AF f/1.4 on ebay for less than $200 . . . Adorama carries them for about $289.