ok, research done...
Originally Posted by SomeJoe7777@Tom'sHardware
If you access tons of small files, a smaller stripe size like 16K or 32K is recommended. For primarily large, sequential accesses like video files, a higher stripe size like 128K is recommended. If you're not doing either one of these, then a good overall size for many applications is 64K.
Originally Posted by Wikipedia
For reads and writes that are larger than the stripe size, such as copying files or video playback, the disks will be seeking to the same position on each disk, so the seek time of the array will be the same as that of a single drive. For reads and writes that are smaller than the stripe size, such as database access, the drives will be able to seek to independently. If the sectors accessed are spread evenly between the two drives, the apparent seek time of the array will be half that of a single drive (assuming the disks in the array have identical access time characteristics).
The transfer speed of the array will be the transfer speed of all the disks added together, limited only by the speed of the RAID controller.
So, it appears that the only thing affected by stripe size is seek time. Read/Write is the same no matter what.
I guess I will be going with 64k.