I'd have to say Bloodlust. Grissom finally says "I need you." And he and Sara have a nice friendly time working the case. Really liked the scene following the blood trail to the park. I think (but I'm not sure) that this is the same episode in which Sara offers to get him a copy of the journal article she just rattled off to him and he says, "I don't need it. I have you." Grissom is so obviously impressed with her brains, memory, and ability to apply knowledge to cases, that rivals only his own. Nice.
There's a sweet moment when Grissom swoops in beside her in the lab and asks, "Where have you been?" Not that he has any new information or needs to ask her anything, just that (it seems) he missed her and was looking for her. They stand REALLY close together and the chemistry is palpable.
Good case all around.
Also a nice moment with a conversation between Sara and Warrick, about the evident racism in this brutal attack on an Indian cab driver. You can see that Sara and Warrick have put their differences behind them and really respect each other.

Wow, this is a tough season for Sara Sidle. Having her relationship with Hank the Skank thrown in her face in front of Grissom, at the humiliating trial in The Accused Is Entitled, and his subsequent pissy treatment of her. Let the Seller Beware was just brutal. The only redeeming factor is Sara's confrontation with Grissom at the end, telling him he's giving her mixed signals (to say the least) and then vanishing.Then Hank betrays her anyway (Crash and Burn). And her close friend betrays her trust as well, the lawyer in the wheelchair. If that wasn't enough, she gets blown up in the lab explosion (Play With Fire) and Sara asks Grissom out to dinner and he turns her down cold. He was pretty much a bastard to her this whole season, other than Bloodlust. God I felt sorry for Sara this season.
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