Fantasy Week Six (6) QB: Garrard, Orton, Palmer, Cel, Pennington?

I'm pretty confident in my fantasy team, with the exception of QB. I've had David Garrard (@Den) and he's done well thus far, but I picked up some other qbs that may outperform him when they travel to Denver. Carson Palmer (@NYJets), Matt Cel (@San Diego), Kyle Orton (@Atl), Pennington (@Hou) to give me more options. I'll end up dropping a couple of them, and am leaning toward starting Orton {I just wish they were playing Det again this week!}. They're basically all same-level qbs, but any hunches will be appreciated and considered.