Yeah Inv saves and normal saves can be taken against Flamer hits, they only ignore cover.
Edit: As for the Daemons, their troops look fragile, but I'm not sure you're going to have the time/range to get too them, so it's all about taking deal with the Screamers and Flamers, the Flamers will annihilate the Paladins, I played a Daemon list with 3 squads of 4 (before WB update) and they took out about 7 Paladins in one shooting phase as I failed to kill FW. Don't forget they're jump infantry so have a 20" or so threat range (12" move and the flamer is about 8" long), so Rob can drop deep and then jump forward into range. The Screamer are quite nasty in combat being AP2 power weapons with 2 attacks each now.
I would consider castling up protecting the Bastion with Coteaz and Paladins, then fanning out from there, the problem will be is that Rob then has board control and I'm not sure the Paladins can fight there way through everything unless you roll like a boss and can take out a unit in your turn and when Rob charges in with the Screamers you deal with them as well!
Good luck either way!
Edit: As for the Daemons, their troops look fragile, but I'm not sure you're going to have the time/range to get too them, so it's all about taking deal with the Screamers and Flamers, the Flamers will annihilate the Paladins, I played a Daemon list with 3 squads of 4 (before WB update) and they took out about 7 Paladins in one shooting phase as I failed to kill FW. Don't forget they're jump infantry so have a 20" or so threat range (12" move and the flamer is about 8" long), so Rob can drop deep and then jump forward into range. The Screamer are quite nasty in combat being AP2 power weapons with 2 attacks each now.
I would consider castling up protecting the Bastion with Coteaz and Paladins, then fanning out from there, the problem will be is that Rob then has board control and I'm not sure the Paladins can fight there way through everything unless you roll like a boss and can take out a unit in your turn and when Rob charges in with the Screamers you deal with them as well!
Good luck either way!