Nothing worth it since you're not going with a RAID1 or RAID5, etc. If you want performance vs cost blance, get 7200 RPM drives with a larger cache that have good performance reviews. You're onboard drive controller should be fine for that.
This is actually better then a one large volume RAID 0 (IMHO) because if you have say 3 drives are 500 gigs each that should be plenty for your needs, if you lose one drive, only only lose that one drive, where as depending on how the JBOD RAID 0 volume is setup if it looks like one large volume, you could corrupt data across the 2 good drives as well if the data is fragmented and on all 3 drives.
Also if you run out of space, you just drop another drive in and it's another data store, no need to expand the RAID 0 volume.