if you can only use M Moore as insurance and have no way of plugging him in as the starter, my gut tells me giving up TO is some expensive insurance. I like Boldin. A LOT. But if Green keeps playing QB carousel it may cause a slight downturn in Quan's numbers.
still, having said that... kind of a toss up. But, if you look at it like this: the dropoff from TO to Boldin isn't nearly what you gain going from Arrington to Moore.
ah, what the heck... pull the trigger!