Just an opinion (which, may not amount to much ), open the ones you absolutely like....
"especially If you are the type of collector that opens them up and haven't got enough room to display them all"

in regards to "M2k7 V.Class EVAC" & "ROTF D.Class EVAC":
Just call the ROTF one "EVAC jr" or "Mini EVAC" if not "Revenge of the Fallen D Class EVAC"

Although, I like the coast guard colour schemes of these two ....
I wish Hasbro could of spared the use of the "EVAC" after had been used once before and used a different Name like "Blades" or something while retaining the colours.