"... and you could find a used one for even less. ..."
I strongly discourage buying cheap lens, or third party lens, used unless you know it's past. At least be able to verify it is in good working and focusing order before.
A new nifty-fifty f1.8 is a 'reasonable' lens, however. Shortcomings noted!
EB
EOS 1D, EOS 1D MK IIn, EOS 1D MK III, EOS 1Ds MK III, EOS 1D MK IV and EOS 1DX and many lenses.
