If we should trade someone, it should probably be David Boston. He looked really good in that preseason game and that should convince the Eagles that Boston is ready to contribute a lot this year. They're desperate, so we can get a premium for Boston.
Remember, he's on a one year contract and if he has a good year for us (which he will, if he stays) he will be gone anyway. We're not winning any super bowls this year, might as well grab some help somewhere long term. I'd give them Boston for a 3rd, or for a good DB that we like.