Terminal stuck at error won't accept any commands.
Well the error you're getting sounds like you've tried changing the $PATH variable somewhere. 
Possible candidates (not all of them need to exist) are 


/etc/profile
/etc/bashrc
~/.bash_profile
~/.bash_login
~/.bashrc
~/.profile


Find all lines starting with export that contain the path you've posted above in those files and prefix them with a # to disable them. Restart iTerm and the error should be gone. 

Regarding the deleted .plist, do you happen to have a TimeMachine (or other) backup that you might recover it from? Before re-installing everything you could also test creating a new user and copying the file from this account to yours.