which one to pick??

I'd go with either of the last 2. If I was buying it for myself I'd take the OCZ Gold. IMO the first 2 are way overpriced to be worth it.
 
In theory it does, I think the BIOS gives you options to run your RAM at 533 (1066DDR) but to hit the 1000MHz DDR mark you'd have to over/underclock the FSB depending on the other settings you set.
 
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