Could also always have one elf sleep first, one elf sleep last.
I'm ok with Mizzi taking either item. The slippers seem more rogue ish, but casting from up high would be highly valuable. And, ring of mind shielding would be equally valuable for a wizard. With the added bonus that it can block Flynn from his telepathy to you. I'm not sure if our characters would know about the second ability, but I would not be suprised if that ring has a soul in it.... considering where we are.