Heres what has happened since I last posted
Took the one away that was always asking for the wireless password.
Re-cloned it from one of the 'good' machines from the other class. Same problem.
Reset pram, disk permission, keychain, everything the internet could suggest. Nothing worked
Upgraded to snow leopard, updated to lastest version of that. Still nothing
Once I had those in it started showing a new Airport update. THIS WORKED!
It stopped asking for the password!
So got it all up to date, cloned it, and then put this new updated image on the other chronic machine that would not connect AT ALL. and that worked too!
So im now slowly passing this image around all of the other macs which just drop out often.
Teacher feedback is that the two re-cloned machines are both doing well :D