Fantasy Baseball Trade Proposal: Need Some Help?

I got proposed a trade where I get Adrian Gonzalez and give up Buster Posey (who is my current starting First Baseman), Curtis Granderson, and Ryan Zimmerman, who'll probably be out for at least a month and is on my bench, since I have no more DL slots left. I really need power, and I'm OK with Geovany Soto as my starting catcher, so is this a good trade for me?