What's the best way to upgrade a mirrored RAID drive?

I have two 3TB Firewire 800 drives which are almost full which I'd like to upgrade.  The drives are configured as striped drives using the Apple (OS-X) RAID utility in disk utility.  Is it possible to configure three drives as RAID 5, or four drives as RAID 10, or am I better off just going for a couple of larger drives and staying with the striped configuration?  The drive is mainly used for an iTunes library, iMovie content and Aperture vaults so speed isn't that critical.
Thanks in advance

You can convert to a striped RAID but not without erasing the drives. The only ways to make a larger mirrored RAID are:
Buy two more identical drives. Make two sets of Striped RAIDs which in turn can be configured into one mirrored RAID by mirroring the two striped RAIDs.
Buy two larger drives, configure as a mirrored RAID, copy the data from the old RAID to the new one, or have two mirrored RAIDs.
Regardless of what you do you may end up erasing the data from the present setup if it involves breaking the RAID. If you break a mirrored RAID the data on each drive will remain intact until you re-use the drives in some other manner such as converting the mirrored RAID to a striped RAID.

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