I'm not a big M1 fan, but even so, they are a classic rifle that has considerable demand, and will only increase in value, while the shotgun Saiga is kind of a goofy novelty gun ,IMO (and I say that as a fan of AK's and saiga's).
If you just tote that M1 around a good gunshow, or list in on your local Armslist, you'll definitely get some interest.