Sacramento is the cancer. I think he would get his head right in Houston. Plus, even with the head case problems he has right now, his numbers are great so they'd only improve in a change of scenery I'd think.
Cousins would be great as a PF so I don't see any need to trade Asik who's one of the best defensive players in the league. The only trade scenario with Asik I could see is if we sign Howard in the Summer. Sign Howard, and then trade Asik to get Cousins, Love, Monroe, or something like that (unlikely but I just really like Monroe and Love).