The 30g'r could end up being the sum total of your collection. Also good for passing files back and forth as well. The Nano is mor edurable due to no moving parts, and I've even heard of one being washed in a pocket and coming back to life after an extended drying period.
Still as a portable, 8 Giggos is more than sufficient IMHO. We'll hook some speakers up to a generator at the 24hrs and it'l be a jukebox.