higher access speed or more cache?

  Naomi1 00:39 22 Nov 2008

I want to renew my system.
Would a WD VelociRaptor with 16MB cache and half the access speed of a WD Caviar Black be quicker than that Caviar, despite its 32 MB cache?
I would like to use the 150GB Raptor for OS and speedy progs, like games, and a bigger disk for the rest, mostly data.
Or would a RAID 0 (striping) setup of two Black Caviars be quicker anyway?
Who's got experience with thes items?

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