If you're worried about that Land raider here's an unpleasant little guy your mate ought to take (so you can focus that predator on vaporising those terminators):
Crisis suit
twin fusion blaster
flamer (cheapest 3rd hard point, and might actually be useful if he survives)
total: 50 something points (I think, don't have my book to hand but it's pretty small anyway)
Have him take this guy as one elite choice. Deep strike him ASAP as close to the Landy/vindicator as you dare and blow it sky high. If he doesn't get it he WILL draw a lot of firepower (taking the flak off you units), so if he dies it's no major problem, and if he does get it (odds are fairly reasonable for 40K) then whoop de do, he can harass terminators for a while until he eventually gets taken down. My Tau army always has one of these Death-Or-Glory boys.
What this means for your marines is you can then focus on the other vehicular threat, but I'd actually go against what a few guys have said and keep that plasma gun, as it's so handy for hunting terminators and marines (soften them up and use your veterans to finish them)
Crisis suit
twin fusion blaster
flamer (cheapest 3rd hard point, and might actually be useful if he survives)
total: 50 something points (I think, don't have my book to hand but it's pretty small anyway)
Have him take this guy as one elite choice. Deep strike him ASAP as close to the Landy/vindicator as you dare and blow it sky high. If he doesn't get it he WILL draw a lot of firepower (taking the flak off you units), so if he dies it's no major problem, and if he does get it (odds are fairly reasonable for 40K) then whoop de do, he can harass terminators for a while until he eventually gets taken down. My Tau army always has one of these Death-Or-Glory boys.
What this means for your marines is you can then focus on the other vehicular threat, but I'd actually go against what a few guys have said and keep that plasma gun, as it's so handy for hunting terminators and marines (soften them up and use your veterans to finish them)