Large RAID stripe size wastes space with small files?

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http://serverfault.com – I'm planning a Maildir storage with RAID 0+1(or RAID 10, RAID 5) on XFS filesystem and XFS will be created with stripe unit and width that RAID will use. I don't determine RAID stripe size yet, but the default value is 128k in my RAID system. If I use 128k stripe size for Maildir storage, does it waste space for a file smaller than the stripe size? I think the average size of files in Maildir is 10k, so what stripe size is the best for this environment? (HowTos)