Hi,
Is the transmission oil level up where it should be? If you don't know where the filler plug is go here:
http://home.comcast.net/~lj_robins/p..._oil_plugs.jpg
That clang may be something in your clutch assembly that is broken, like maybe one of the fins in the pressure plate, or the throw out bearing. On that note it may not be the transmission at all and could be that your CV-Joints have gone bad.
I'm not sure what would be compatible with your car, call the junk yards they can tell you what other cars have a transmission that will work.