The 1c should be Stamkos in 2 years. Until then, play Step, Brass, and JT.
If Staal is moved he should bring in something else of need, other than a 1c.
Personally, I'd try and keep Staal, pair him with Girardi on the 2nd line next year, and trade for Mike Green or Kevin Shattenkirk to pair with McD.
Makes 1 mobile offensive pairing that will be pretty damn good defensively. Makes 1 defensive pairing that will predominantly be used to shut teams down. And makes a 3rd pairing where Klein will be matched up with either Conor Allen or John Moore, a formidable 3rd pairing that can handle lower lines and eat minutes.
That's how I'd approach it. Stralman is great but we lack offense on the blue line. Danny G and Staal were a great shut down pairing in their hay-day. Bring that back together. Get someone offensive minded for McD - Mike Green, Kevin Shattenkirk, someone like that? Mike Green is a FA next year. Washington has a new GM and will likely shed some contracts. Shattenkirk will take the house in 1-2 years. Green is 28. Shattenkirk 25.
Wonder if you can get Green for something like Kristo and something.