Mcdavid, Hall, and possibly Nurse depending how he turns out.
The rest are just replaceable NHL parts that every NHL team has.
Your idea of replaceable is a lot diffrent then mine
McDavid
Hall
Eberle
RNH
Ference
Nikitin
Schultz
Fraser
Scrivens
Hunt
Hall, RNH, McDavid, and Nurse.
I'll take "Garbage I want to Trade" for $1000 Alex.
McDavid, Hall and Nugent-Hopkins.
The true interest of this post is how many people think the untradables are more than 3 or less than 3.
We love to fall in love with these players and want to watch them succeed but a GM's job is to constant consider EVERY player tradable. Not to be naive about it, but to consider it.
Easier said than done