I'm honestly fine with any of Indiana, Miami, Philadelphia.
Both MIA & PHI have big men who tend to kill us (Whiteside, Embiid) and great talents (Simmons, Waiters, etc.), but you wonder if they have enough behind that to win a series against us. Also Sixers are still relatively inexperienced with their team in terms of playoff games.
As for Indiana, really as long as we "contain" Oladipo, we should be fine.
They won't be easy series, BUT I feel we can take any of them, and really as long as we put out that defensive effort that's gotten us this far (especially from November-January) as well as get Playoff Kyrie, we can beat any of the three in 5-6 games.
My Vote? Indiana. Oladipo could beat us in a game and put up great stats, but in a series it won't work for IND unless they play elite defense or someone else steps up big time for them.