There are a lot of them, but I can't think of many off the top of my head. I like Argent, but I prefer KISS's version of God Gave Rock'n'Roll To You. Even Russ Ballard has said he prefers KISS's version, and he wrote and originally sang it!
Without You. I think Nilsson's version is THE version.
Oh, and I very much prefer Sinatra's version of Yesterday.
Now that we mentioned Sinatra, his version of It Was A Very Good Year is better than the original.