ok, here's my .02
6spd z28 is what you want, get ttops because convert's are insurance killers, and hard tops look like shit IMO. i'd get a pre96 because i think that's the year they got obd2(or something like that) it's a huge PITA from what i've heard. i wouldn't get a 93, they had some problems when i was looking at fourth gen fbody's back in 2000. i got a 94, and have only had one problem with it, the cam position sensors went bad, it seems they are right under the water pump, so when that leaks, you have to replace those. i was told that they have magnetic sensors that tell the ignition system where the cams are and that's how the plugs fire. makes sense to me so i'll go with that. to fix these the dealer replaced all sorts of parts till they found the problem. 3 grand later i was back on the road.
otherwise, great car, i miss it. it would make a bad day fade away with a quick fishtail. and also invest in a valentine radar detector :-P
happy hunting