This team seems inclined to shell out for hitters and has done so with Donaldson. In general, it's the safer investment of money than in a pitcher.
So, with that in mind - go hard after Seager. He could be a cornerstone for close to a decade and you won't regret the money you paid out. He's 27, he can hit, he can field, a deal that's 8 years/200M is probably what it'll take and this team can afford that. Plus, he plays and helps out every pitcher who is put out there every day.