Superman (current) vs. Goku
I think Superman would win.
Here's why:
Supes shoots a beam of low-intensity Heat Vision at the Moon. People in the watch tower was blinded except for Plastic Man cause sense he had shades on. The Moon is very far from Earth, this shows the range Supes Heat Vision has.
http://img225.imageshack.us/img225/9708/supermansheatvision24vv.jpg
Goku can be blind by solar flare.
In this pic it shows that Supes Heat Vision stated by them, "his vision is off the charts by any standard scientific measures". They can measure how hot a star is, but they cannot measure the temp of Supermans Heat Vision.
http://img225.imageshack.us/img225/863/supermansheatvision30nk.jpg
Goku's ki blasts can't reach the limits of the Sun.
Here's Superman reading at high speeds (something Goku or any of the DBZ/GT characters ever done).
http://img366.imageshack.us/img366/4955/superman1451ba.jpg
Goku can't comprehend multiple languages at once, Superman can. Goku's intellegence is that of a normal human, and he can't comprehend multiple people talking at once.
Superman fighting at high speeds.
http://img378.imageshack.us/img378/9558/supermanandmongul8pr.jpg
The suit actually increases Mongul's speed and power. Superman held back.
Superman has lifted moutains before and if Goku never done it before or something similar, he can't be Superman's equal.
http://imageshack.us/photo/my-images/468/eradscrazy7mr.jpg/
Superman's durability has been surviving explosions of stars, which are hotter than ki blasts and the impact is much greater.
Superman taking a blast equal to a million nuclear blasts.
http://i4.photobucket.com/albums/y112/avalonofthewind/supesnuke.jpg
http://i4.photobucket.com/albums/y112/avalonofthewind/supesnuke2.jpg
Goku can't survive the tempatures of lava.