Lets see, one of two players who are on good contracts, are able to man a PP, and are pretty good defensively? I would have parted with one of Nyquist or Tatar and a B level prospect and a 2nd round pick easily.
Why? Because they are under team control, they are relatively young, and they fill a need that doesn't disappear the second week of April.
Nyquist is holding a good pace with 2008 Mule for points and Tatar is a top young talent that keeps getting better and is at .5 points per game in his 1st NHL season getting sparing minutes. I wouldn't give up either of them at this point for anything less than a package deal to get a 1-2 Dman.