Okay, cool.
I like your idea of signing both, although I would be more comfortable doing so a little later in the season so we can see that both still have enough to be worth signing.
Everyone seems preoccupied with Koji being 41. I say hogwash. As long as he can bring that splitter to each game he should be useful. No, I do not expect 2013 Koji every game.
For years I have seen Taz as the work horse of our BP staff. I think that he gets over used and hope that the Sox can stay away from wearing him out by July.