You have to keep Arod, Kinsler, Quentin, Berkman and one of those SPs. Lincecum is real juicy and I could understand you wanting to keep him. This year he had 265 Ks, for crimey sakes. But Webb is a perennial Cy Young candidate. Starters aren't very safe, but Webb's one of the safer ones. Also, Lincecum threw lots of pitches this year and a lot more innings than last year.
With regard to Lincecum vs. Webb for next year... I wonder if people are going to be expecting 18 wins from Tiny Tim, again. I don't see the Giants getting any better in 2009. And while I don't have the stats at my fingertips to back it up, I'm at least curious about how much run support Lincecum got than, say, Cain. Regardless, if Lincecum's ERA goes up to even the low 3s, I have a hard time imagining him notching nearly as many Ws. But maybe I'm wrong. All I'm trying to say is that I agree with Grey about Webb being safe/proven/etc., and those are important commodities in fantasy. But also of value is that he plays for a better offensive team.