I'm surprised that there is even a quesiton as to whether Nate is an upgrade over House. He clearly brings MUCH more to the table. I understand some worry about his attitude, but count me among those who doubt this will be a problem.
The best we can hope for out of trade deadline deal is a slight upgrade. We already have, when healthy, one of the top 2 or 3 teams in the league. You are not going to upgrade the starting 5 -- let's be grateful for anything that upgrades the rotation. Nate would.