I'd like to see Jade back in the DCU. She's always been a bit under used though. I think she should be in the JSA, or maybe in the League to represent the commitment of the other Lanterns to the new Corps. I dunno who I'd lose. During the 90s, it would have been Guy Gardner, but I like him more now. Probably Jason Todd, little Red Riding Hood should have stayed dead.
I've no real beefs at Marvel, so there's no one I'd want to lose. I don't like the way they punked Cap, but he'll be back soon I imagine.