I would be inclined to keep Staal.
If you can get Stepan, Ladd and Carlson for Mueller and MDZ then that would be an absolute steal in my books.
Now here's the thing. If Mueller stays injury free and produces at the potential he is capable of then you may be kicking yourself.
Either way though, I think that would be your best option.
Hope that helps.
Wet Coast Hockey League
Keeper - Pts. Only
Dobber Hockey Pro - Wales
G/A/+-/PPP/SOG/HITS - W/GAA/SV
Trial and Error
Final position 8th
Future objective Champion
Frustration level On hold till next season
Check out these links for writing tips and writing competitions.