I also had the ATX-Pro series lenses, and was very, very happy with their performance - 35-70mm from memory.
Have you looked at the Tamron Adaptall series? These are also excellent value for money.
I sold off my 28mm f2.5 FD fixed when I changed to EF. Kicking myself for doing so - buying another cost more than the first time around! (And both were used.)
Extremely sharp, good contrast and compact - seriously considered buying an Canon EF 28mm or 24mm, but the price was ridiculous for a lens I would only be using on my film body, so I picked the Tamron instead.