tough call, really what you want.
I think with a single overflow you can get returns and pumps in to cover that.
I have a 84x24x24 tank with dual overflows that I am gonna sell because while it would make most people happy I want something a little bit different in our new entry way and a single overflow.
To each their own, we spend enough money as it is so what's a little more if you really like the brinck set up