I am using a 75 in my 210g. I think Phillip is doing the same. I had a 55g in my 125g. I always want to add to the total water volume, due to your volume being so high to start with, it is not so necessary.
Your only issue will be skimmer. If you go in sump, you will need a lot of space for a skimmer rated big enough for 380g + sump.
I would go at least 75g.