Go to the website of whoever made your new drive. They should have some tools there that will let you copy things over. (at least they have in the past.)
As for RAIDing drives together, you can actually RAID together very different drives. What happens is that the faster drive will get done first, then wait for the slower drive to finish. This basically makes both drives perform at the speed of the slowest drive. I can also pretty much guarantee that you don't need AID0. Home users don't need it, even for gaming.