If I had to choose between solid, x drilled and vented, I would go with vented. They will cool alot better than a solid disk. The principal behind a vented disk is that as the disk rotates, air can move from the center of the disk to the outer perimeter of the disk internally. This aids in cooling dramatically over a solid disk with must radiate the head (radiation helps with the vented disk also...)
my .02c
Sandeep
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