[Dunkman]

1 is fine with the blind increase coming I'm not giving that guy credit for anything
2 kinda meh, I'd fold with an M over 6 still and no antes yet, but I don't think it's terrible or anything
3 good
4 fold

edit: the more I think about it the less I like the first one with the chance the limper actually has something nice+the chance someone behind has something. After all, your M is still like 7, although it's going down really soon.