I'd love to see Howard join Harden in Houston.
First of all, the three H thing is really nice.
But second of all, I think it's a perfect situation for him. Harden will get to be the man who takes the big shots and bears the brunt of expectations, while Howard can be the best player on the team who anchors the defense and gets his own off pick and roll feeds from Lin and Harden.
If the Rockets get Howard, though, they need to upgrade that PF position.