Honestly without the RB, I wouldn't be even messing around with these ipods.
Based on my observations of the msata's performance so far with this RB patch, my gut feeling is the ipod 5.5g may well be able to handle a 1 TB drive nicely. I reserve the right to go beyond the 480GB when I am mad.
I can also use the ipod as a portable drive to backup my non music file (got lots of RAW files from another hobby). This is insane.
Now the question is how long these decade-old ipod boards can last, theoretically.