
Just two?
PRISM and Sport Kiss, probably.
Yes, I know, you said both must be rated to 100 m, but you can only dive
one at a time anyway. So I rather cover the bases by having one unit that
does the 100 m and one that travels extremely well, is quick and easy to
(dis-)assemble, offers an alternate CL postion, affordable and, and, and.
Other contenders for a spot besides the PRISM would be the MK15.5 ($$$
and not so good for travel, pita to keep going), the Ouroboros ($$$ and not
so good for travel either) or maybe the Shadow Pack III when it hits the
market. Although a unit with rear mounted lungs would add some more
variety.