Delgado's back now - he was in the lineup yesterday.
As long as Payton has home games, start him unless you're desperate for sb's. If Colorado's on the road, it's a toss-up - I'd probably stick with Payton for the time being.
All things being even, I'd choose Furcal, but I'd really decide this by matchups. Both are putting up similar numbers now (and both are excellent choices).
Drew may not be a major contributor any more this year, but he's certainly worth keeping for next season.