I can see both sides here. You have OF depth, so trading an OF makes sense. You have a lot of good pitching but you don't have an ace. Cruz has looked pretty lost at the plate these past weeks. Your closing situation is also pretty tenuous.
However, I still wouldn't make the deal. Nelson Cruz is just too (potentially) good. And your pitching staff isn't hurting - you've got a whole bunch of live arms there. I would definitely look to trade an OF, though.