http://www.animeforum.com/showthread.php?t=60474Use that link there as a guide and see where the reasoning comes from...not all of them are complete jack asses...so yar...
Personally, I believe Goku might be defeated by Vegeta or Broly...I think Broly died more than Goku did.
I'm thinking Vegeta, and I'm wondering if Goku's lack of brains would cause him to lose half the battles...or his kindness >>....in fact I think Goku's pretty damn strong, and I'm seeing alot of Naruto Charcters.
There's no way I think any Naruto characters could compare, unless of course the Naruto producers overtake DBZ, then change the ending by making cameo apperances by Naruto and friends...then killing Goku...again...