Pittman. He has been one of the best RB's the past 5 weeks. ESPN had a similar question in one of their daily chats (either today's or yesterday's), and they also said Pittman.
EDIT: On Pittman
Well, I agree and disagree. I didn't think he was very good six weeks ago either. He had a long track record of not scoring. In fact, in the fantasy newsletter I wrote that fantasy owners compared him to Beavis & Butthead. With one touchdown in his first 34 games with Tampa, he never scored. Well, unlike fictional characters, Pittman is a scoring machine now, with seven touchdowns in the past four weeks, and nine scores in seven 2004 games. Is he a GOOD back? Well, you're right, he only runs well against bad run defenses. But here's where I disagree. He's fantasy's TOP back for the last four weeks. He's the best. He's scoring on the ground and the air. He's finding a way, and there are no other Tampa backs. And his schedule is actually very favorable. So I guess I'm saying it's not important whether the guy is overrated or not, he's putting up terrific fantasy stats.