I need to upgrade my HDD's and was thinking about...

Western Digital Raptor 74GB 10K RPM - Main OS

Western Digital 8MB 250GB - Storrage

Since they both have SATA connectors I need to upgrade my MB also becuase my current one is the one that came with my computer I bought 2-3 years ago. Now should I buy a top of the line MB or should I wait for the new Intel chipset ones with the PCA Express or whatever its called?