I'd stick with fixed lenses.. F/2.8 zooms are just not meant for lil' FA's
As much as I like primes and my Nikons, I have a pretty nice selection for my Minolta cameras and to duplicate that system in Nikon would cost me upwards of $1k. So far, my 75-150 has been used the most on the FA. With the motor drive it's a very well balanced rig and is often a companion to my medium format for portraits loaded with Neopan 400 shot at 640 and pushed 1 stop.
UPDATE - I bought the K3 screen and installed it today. WOW! Anyone who has a FA should get this screen - it's cheap ($35 from Adorama) and easy to install with the included tweezers. I had to clean off the mirror bumper goo first and replace with some adhesive felt, but that only added 10 minutes or so to the operation. The 28-80 I bought is f/5.6 at the long end and the screen doesn't even come close to blacking out.