I would love to add Keith Yandle.
Miller + John Moore + pick/prospect
Would be the most I'd do, though.
Keep Staal for a deep run this season. Worry about him in the summer. But effectively, adding Yandle would mean Staal is gone after the season. I'd take that swap, though.
I'd do that trade every day...
a) Yandle takes Moore's minutes
b) Plays with a stay at home player in Klein
c) Adds another dimension of offense
d) Replaces Staal next season
The only question mark is whether or not Allen is ready to jump on the 3rd pairing by that time, which judging by the camp he showed, is most certainly an idea that can be entertained.
Eventually you can move Klein for a forward upgrade, and recall McIlrath. The 1st pairing of Hartford becomes the 3rd pairing here. Chemistry is not a factor at that point.