The Rangers front office better be planning on talking extension with Stralman's camp. I could care less what his value around the league is, he's been great for us. Sign him for 3-4 years at a reasonable cap hit (~$3M), and I'd be all for it.
Girardi, Stralman, Klein is great RD depth. Quality RD are at a premium around the league, and to lock up 3 quality players would be key for this team. Regarding McIlrath and Allen, make them earn it. There are going to be injuries eventually, and if they play well enough to push someone out, then you flip Stralman or Klein for another piece.
You lose nothing by extending Stralman. If Allen or McIlrath can't force their way into the lineup, why would we want to ice an inferior team just to give a prospect a shot? This is Detroit's approach, and has worked pretty damn well for them over the long term.