Well i worked at best buy for a while and that is a really good price for what you're getting. Also just looked up a few prices best buy is the cheapest. So go for it. You have 15 days to find one for a cheaper price to price match anyway.
I have an mg278q with a 1080, was $375 last black Friday, this black Friday it was only $300. What a shame you didn't get that one then. They had a Dell dell s2716dg for $300, too