I've given it some real thought...
I'm going to go with Kevin Durant (obvious answer) and Steph Curry even though Steph Curry wouldn't necessarily be the most straight-forward #2. Here's my reasoning.
#1 - It's a buyers market for bigs. Multiple teams are trying to unload bigs and supposedly there's no market for them right now. By adding KD and Steph magically to this team, it suddenly makes high-value guards like Thomas and Bradley expendable. You could afford to put one of them on the market for the highest bidder. Obviously guys like Nerlens Noel, Jahlil Okafor, Greg Monroe, etc would be easily acquirable. But we could also aim higher for DeMarcus Cousins (who I still think will hit the market). Even a small-potatoes trade for a guy like Andrew Bogut to would be reasonably accomplished. As is, we'd be looking at a lineup of PG - Steph, SG - Bradley, SF - Durant PF - Crowder, C - Horford with Thomas, Smart, Amir, etc off the bench. But our flexibility in acquiring big man help couldn't be overlooked.
#2 - Take Steph and Durant off the Warriors and goodbye Golden State Globetrotters. That team is no longer a significant threat. I want very much for that team to suffer. Simply removing Durant wouldn't be enough. Let's take Steph away from them too.
Seems logical to me. If LeBron is a no-no, we might as well get the other two MVP players and figure out the rest of the roster via trades.