If you're rebuilding, Lundqvist's time is done here. Zucca can stay through the rebuild, but he's not a building block. Dorsett, I couldn't care either way. He's good for what he is.
I'd keep Staal and McD. They're the towers you can build a D around and Staal is only 26 (if I'm moving one, it's Staal I guess). I'd keep Hagelin and Stepan too I guess. I'd probably keep Callahan to oversee the rebuild a bit, and because he's more valuable to us than in a trade. In the end though, I'm not sure you have to keep anyone, specifically. Those are just the guys I would consider keeping around.
You offer Nash, Girardi, Brass (unless he really picks it up), Lundqvist, Cally, Boyle and everything else and you stock pile picks and actual prospects. Imagine having a guy like Hertl in our system? The two young pillars on defense become the team leaders and, the most important thing from then on, is to develop a culture and philosophy starting with who you're drafting, extending down into being drilled into the young guys in Hartford and finally being followed to the letter by players and staff with the big club. In about 4-5 years, Staal is barely over 30, McD is about 29 and the rest of the club is under 30 and, if the rebuild was successful, ready to rock and roll.