I'm going with 85. I'm usually more pessimistic, but my gut says above .500 this year.
On paper, the Pirates, Astros, and Cardinals look bad to me. That's 45 games, of which the Reds should win 2 out of every 3. 30 wins right there already. If they just split with the Brewers and Cubs, that's another 15 wins. 13 more games against bottom dwellers Washington and San Fran, so that's about 10 more wins.
I'm up to 55 wins already out of 88 games. Just win at least 30 out of the other 74, and you've got 85 wins.
See how easy that was? Print the playoff tickets right now.