Wayyyy too many untouchables here.
The great part about having prospect depth is that it allows you to flip that depth for players that put you over the top. In essence, prospect depth lessens the "untouchability" of your players.
My list is short.
Reinhart - No. 1 center
Ristolainen - No. 1 defenseman
BUF 2015 1st (assuming it's top five)
Girgensons and Zadorov would be a tough get (McCabe, Compher and Pysyk to a lesser extent) but I'd part with both if the right player was coming back (and that player had better be a superstar). Guys like Armia, Grigorenko, Bailey, Hurley, Baptiste, Larsson, Carrier, Lemieux, Cornel, Karabacek, Martin (and again, to a lesser extent, Compher, McCabe, Pysyk) etc. are the kinds of players I would hope Murray uses as currency for the right players when this team is in a position to contend.
The players he doesn't flip from that list can be valuable contributors to a cup contender, but they aren't the leaders on a cup contender.