If I was the Astros, I'd ask for Storen, but be realistic about expecting less. As for Detwiler, I'd trade him for Bourn - but it would really depend how much else the Astros wanted with Detwiler.
If Rizzo kiboshed Detwiler for Bourn straight up - hand me my [Fire Rizzo] sign and tell me where to march...
Maybe Rizzo is trying to pump up Detwiler's value. Rizzo may be floating Detwiler's name to see if there is any interest.