This darn post was keeping me awake last night! But, I did get it figured out. While I love Liam Neeson and think he would be more than fine, Russell Crowe would be PERFECT as Barney. Christian Slater would get Willie just right. Oh, and Joseph Fiennes as Quentin! I like the idea of Katie Holmes as Maggie, though I wouldn't mind new ingenues in the girls' roles in keeping with DS tradition.
Actually, I prefer the idea of a second generation and bringing some of the original cast back as the older generation. But it IS fun to recast the old crew.