What is acceptable? Revere's .333 OBP was .014 points higher than average. but, my argument all along is that Revere should be extended, and paid, as a 9 hitter, not as a replacement for Span in the order at leadoff. Mauer or Hicks might be the better choice for that. .350 is good, .360 or higher is better. But really, I want a guy who isn't so reliant on BABIP so I look at BB%. 8% is pretty good, 9-10% is better. Span walked around 8.5% of the time last season, I believe. Mauer was almost at 14%, IIRC. Revere was around 5%. That's bad. And as others have mentioned, you don't worry about extending your #9 hitter.