Predictions highlighted in Red...
Ferrari- Vettel/Raikkonen
Mercedes- Hamilton/Rosberg
Haas- Grosjean/Gutierrez
Renault- Maldonado/Sirotkin
Manor- Vandoorne/Rossi
McLaren- Alonso/Button
Force India- Hulkenberg/Perez
Red Bull- Riccardo/Kvyat
Sauber- Ericsson/Nasr
Toro Rosso- Verstappen/Sainz
Williams- Bottas/Massa
The only one I see as a bit of a stretch is Sirotkin. But I can see it because he has truckloads of cash, and he's 3rd in GP2 standings.
Vandoorne may not be with Manor, however I think he will get a ride next season. He's a McLaren developmental driver, although it seems like he is pretty desperate to get on the grid. Plus Manor might not be that bad next year if they become Mercedes B-Team!