Good thing about FD lenses is that they are very inexpensive. Try the FD 28mm F2.8 for starters, good all round and cheap as chips. I think there are a couple of FD lenses in the Apug classifieds at the moment, worth a look.
I had my FT's converted to use S76 (silver oxide) batteries, not expensive and the S76's last for at least a year or two...also available everywhere.