Which QB do I start this week?

I have Phillip Rivers, but the matchup is obviously scary against Denver. There are options on the waiver wire:
Ben Roethlisberger
Andy Dalton
Trevor Siemian
Josh McCown
Blake Bortles

Should I stick with Rivers or stream one of the quarterbacks above?

He hasn’t done much so far but I think Big Ben will have a huge game at home this week…