The WCC people don't believe in going the toes because it displaces the weight forward which makes you less balanced and for some reason having a greater surface area contacting the floor is good as well.
I'm at school right, I'll get the quote from the DVD's tomorrow.
They also say that they think Gardev(sp?) has the best snatch technique, so find of video of him and you will see how he stays on his feet the whole time and makes a little flatfooted jump back just before he goes under the bar.
I do remember this quote from the DVD: "If you want the body to go higher, go up on the toes. If you want the weight to go higher, stay on your feet."