I would quite like a cheap prime for my T2i right now, and I'm torn between these three. Your opinions are greatly appreciated.
Helios 44-2 58mm f/2.0
http://cgi.ebay.com/Helios-44-2-58-2-lens-screw-M42-Canon-EOS-5057-/320605508108?pt=Camera_Lenses&hash=item4aa593d20c
Canon 50mm f/1.4(FD mount w/adapter)
http://cgi.ebay.com/CANON-FD-50mm-f-1-4-Lens-EF-Adapter-Canon-EOS-/220685214941?pt=Camera_Lenses&hash=item3361dd24dd
Helios 44m 58mm f/2.0
http://cgi.ebay.com/Helios-44M-58-2-lens-screw-M42-Canon-EOS-6586-/320604422206?pt=Camera_Lenses&hash=item4aa583403e