I really think Houston is going to make a hard bid for Smith ASAP, in order to help entice Howard (and perhaps even Deron Williams).
I would not be suprised if the #18 pick is, in fact, part of a deal for Smith, along with Dalembert's partially guaranteed contract and another young guy like whichever Morris brother they have.
Then they use the high lottery picks/young players they get for Lowry/14/16 along with Martin and perhaps Scola to try to get Howard.
And sign Williams with their remaining cap space.
A Williams/Smith/Howard combination could be real fun.