Seeing this post late. But wanted to add, a 50mm 1:1.4 Nikkor or a Takumar with it's whispering smooth focusing are joys to use. Both with film, and with low ISO digital.
Play around with crop sizes, and they become rather versatile too. Imagine what a 75mm 1:1.4 costs? My traveling kit of two cameras, often combines a normal film format (135), with a DX sensor for this very purpose.
Normal lenses are also particularly useful with older DSLRs like the magnificent D2H. Great camera. The D2X too. But their Achilles tendon is low light performance. A fast, normal lens helps.
And in a pinch, these nifty fifties are sharp enough to allow images to be magnified a bit. A 3x or 4x is not unreasonable. Beats dragging the 80-200/2.8 D around all the time. (Although I will concede, a 135/2.8 is not as bad.)
Some manufacturers, such as Canon with their FD line, even made 2x macro converters specifically to be used with their 50mm lenses. Pretty useful, a small converter affords you both macro and a decent portrait, short telephoto to very easily handhold and photo with....