I will agree with you that starting any WR or QB against Pit right now is a very, very, very, extremely, immensely, dumb, moronic and stupid thing to do. As much as it may bother you, Boldin is best left on the bench this week. Whatever you do, DO NOT pay attention to the "projected stats" if your league has them. They're right less than 50% of the time.
Murphy vs Hou is interesting but I also don't like that matchup, but for reasons other than you might think. Oakland is not very good against the run. Houston has Arian Foster. I expect a 70/30 run to pass ratio (much like Hou did to Ind in week 1) and I also feel that Oak will do the same because of their success on the ground so far with McFadden and the return of M. Bush. I just don't see much of a passing game in this one. Running the ball against a bad rushing defense will be too inviting for Houston and it's also all that Oakland does well. Murphy is not a terrible play, I just think he'll have a slightly less than expected performance. Despite what I just wrote, however, I think he's your second best option. I like S. Smith's matchup even less.
I do like Megatron against GB. He'll put up good numbers no matter who's throwing the ball. He's never really had a QB in the past and it's never stopped him. He's your top guy.
I suppose I could have just responded "Johnson and Murphy" without all of the explaining, but what fun would that be???