I actually use two old ATA drives that I striped over two FW800 external cases – but I just use it as a backup and archive drive.
I agree with Mitch – SATA drives striped are the way to go for 10bit UC. I have two 250gb internals in my Dual 1G with a SATA controler card. Recently, I had a client purchase a burly box with 4 drives and a 4×4 SATA card. It’s been a champ – but you don’t have any parity protection. So, there’s always a slight risk. Backup backup backup.
As for the Io, I’m a big fan. Get the full size. The options alone are worth the money. Unless some magic bullet comes out for HD and SD I don’t think I’ll be selling mine on eBay for a very long time. Also, I cut a lot of news-based pieces and use DV50 for offline/output to Beta SP or Digibeta. If I was doing a show with a lot of graphics or need for color correction, then I’d consider 10bit.
Recently, I used the Io to do color work on a show for OLN shot on the DVX100a. It’s a champ.
Good Luck,
Micahel