I'm a little confused by what I should choose (2.8 versus 3.0) for a new Mac Pro. I've read that the new 2.8 uses a new design compared to the 3.0, which makes it faster than the (old design) 3.0, even though it is 0.2ghz less and $750 less. Is this true? Which is faster, the 2.8 or the 3.0? Is the 3.0 option on the Mac Pro now a harper or a clover 3.0?