Re: More trade advice needed...
I would do trade #1. I think Webb is going to have an outstanding year, plus the offense behind him is much better than Pineiro's. Rhodes for Nathan is a bit of a step down, but I think that is more than offset by Pineiro for Webb. Plus, I think Nathan will get plenty of save opportunites, mostly because there isn't anyone in that bullpen that will challenge him.
I don't know if I'd try to get Clemens at that price. Despite his great first outing I think he'll come back to earth at some point, and that ballpark scares me.