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What are the specs on the 512GB?

Write Speed??
Read Speed??
etc

Estimated 250mb/s read, 220mb/s write... This is (and making a big) assumption they are using samsung ssd's (which no one knows for sure yet). They'll almost guaranteed be using SataII, which will be somewhere in that ballpark.
 
If this is the case, you might be better off buying two SSDs and putting them in Raid0 (only if you don't need the optical drive).

With two Intel X18 G2's in Raid0 seq. read is 500-550MB/s write is 480-500MB/s (roughly double the speed of each drive individually).
 
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