Durant and Bargnani, for Gasol, Nene and Kirilenko
I would take the trade, mainly for Durant's upside as the season goes on.
Pau does look like a monster this year so far. His stats usually go down playing next to Bynum, but not by much. Nene should improve as he recovers from his groin injury, and will probably end the season worth about the same as Bargnan. Kirilenko is always an injury risk.
After the trade, your team is going to be weak on boards so you'll probably need to re-tool again. One thing to consider is trading your jumpshooting bigs (Gallo, Blatche, Bargs, CV, Harrington) for a true center.