I have mixed feelings about possibly signing Modano. We get bigger and more talented, but we get slower and older as well. As far as lines go, as much as I'd like to see Abs and Ritola get a chance, the possibility of being able to ice Eaves-Helm-Miller as our fourth line sounds pretty kick ass to me. Also, the prospect of having four players over 200lbs and over 6' (Modano, Holmstrom, Franzen, Bertuzzi) on the first two lines, each centered by Datsyuk or Zettergerg, could be overwhelming to opponents' defense.
For his age Modano still has a pretty good set of wheels. I don't think he will hurt us at all in that regard.