I actually don't know how it would work out, but you're right, starters are more important -- because they can be shuttled in on start days and then moved out, while hitters just waste points on the bench. Figure out your projection for Strasburg, Pedroia, Hill, and the best starter still on the wire. (An average projection, not upside. And remembering that Strasburg may have an innings limit, you should tack on some 'average pitcher' innings to his, since you'll drop him for someone else if he gets shut down.) Then see if the gain you get from switching from Hill to Pedroia is greater than what you get from Strasburg over the best pitcher you can pick up. (Sorry -- too much work for me. This is why it's always tough giving advice on points leagues.)
I'd look to trade a hitter for a starter, regardless. Whoever suggested shopping Davis, I agree, that'd be the first one I'd try. Pence and Ramirez should be fine in the util slot.