I would decline the first offer. I don't think Oshie and Galchenyuk is good value for Tavares. I'm not particularly high on Oshie as a consistent point-producer long-term and while Galchenyuk is a prize young forward to have, Tavares has proven his worth and I don't think he's hit his ceiling yet. I think Tavares will out-produce Oshie and Galchenyuk for some time to come.
As far as the second deal goes, taking on Kopitar's $6.8M is steep. How does the free agency market look in your pool in the summer? Are there any good goalies that you could acquire when you lose Smith?