When you say track do you mean fun days or competitive stuff? If serious about track you can rule out most of the older stuff as they will never be competitive.
Forget about an AW11 unless you get a supercharged one, you will have to pour alot of money into an n/a one to get any decent power. You can run a pulley on the supercharger and run around 11-13 psi, my old s/c aw11 had 100rwkw just with that done. Mind you besides doing cams and intake/exhaust mods thats about all you can do to them with alot of money been spent. They are alot of fun though, felt more like 150rwkw compared to other cars i've driven.
I wouldnt bother with any KE earlier then an ke70/ae71, there not designed to be tracked, try and find an ae71 as they have the t50 box and a 4ag will bolt straight in. IMO there older ones are more for the oldschool guy who wants a little fun, they will never be as quick as something like a s13 or similar just due to there suspension setup.
If your not that serious about track and just want a fun car in general then really anything goes, your better of trying to find something thats not a cop magnet, so an old corolla or celica, datto or similar. You dont need much power to have fun, my old ae86 had bugger all from the 4ag but it was alot of fun, the sound of the thing was awesome.