The F2AS is one of the most desirable Nikons. If you can live with an F2A (which is functionally very similar, save for non-AI metering), you can save a lot of money.
This is not correct. Both the Nikon F2A and the Nikon F2AS use AI-Nikkors for wide-open metering. Both have auto-aperture indexing. Both require stop-down metering with non-AI lenses. The difference is that the F2AS has the silicon-diode metering system, which is far more sensitive in low light, and uses LED's in the finder. The F2A uses the older and less responsive CdS cells with a match-needle in the finder. The problem with the F2AS is that you can be only 1/2 stop off from the correct exposure and the finder lights up only one of the over or under red lights. You can't tell if you are six f/stops off or only 1/2 stop off. That problem was corrected in the Nikon's next meter version, which is much more difficult to find, the Nikon F2Sb, which has a series of LED's (I think there were five) to indicate how far from correct exposure you are. The F2Sb is also slightly smaller than the F2S. BTW, both the F2S and the F2Sb are difficult to use in bright sunshine because the LED's are hard to see. On the other hand, they are a pleasure to use in very low light.