I'm very, very, very sure the 4th is out of reach. The Blazers really like Morrison and Aldridge.
It's true that they want Miles out, but they could get much more than Chris Mihm for the 4th pick overall. Yeah, they could use some veterans, but is Chris Mihm the veteran you trade the 4th pick overall (potentially Rudy Gay or Adam Morrison) for? Be realistic fellas.
A more realistic scenario that has been brought up is Mihm, McKie, Cook, and a future 2nd for Miles, Blake, and the 31st.
I'd definetely go after it. I'm definetely for getting Miles, but getting the 31st and a solid 2-way PG seals the deal.