I wouldn't look for a trade with Landy because it'll be too expensive to draw him away from Houston. Likely the whole MLE or at least near to it. I don't think Houston will have to pay that much, but I do think to get him out of there you'd need to overpay to convince Houston not to resign him. Since we have Powe, might as well develop him and hope we can resign him to a cheaper contract.
Yeps, but one can try to imagine a deal that could benefit both teams:
Houston signs Landry for $4.8 million/year and trades him to Boston.
Boston sends Scalabrine+Powe+$3 million in cash.
Boston would be paying Landry $9.6 million for the next 2 years, but would save $6.6 million from Scal's salary and Powe's salaries in the next 2 years ($4.6 million, assuming he signs for $3.9 million). That's a $1.6 million difference, which considering luxury tax means a $3.2 million saving. Even sending the money to Houston, Boston would be saving money in the next 2 years to replace Scal and Powe with Landry.
Houston would get the money to pay a year of Scal's contract (or more than half of the money they'll need to a buyout) and negotiate an extension to Powe. In 2 years, they'd spend $8.2 million (Scal+Powe salaries minus cash considerations), probably less than what Landry is asking and certainly better than seeing him bolting for Europe and loosing him for nothing.
I'd do this, if I was Boston; the problem is that I think that Houston doesn't rate Powe at Landry's level.