One of the reasons I ride C&V bike is because in the good ole days they made bikes in this size. At least through the 80's you could still get them with straight top tubes. None of that 4 sizes fit all that is being pushed.
If you are over 6'5" and don't want to go custom, the best option is a bike from the 70's or 80's. My smallest bike is a 65cm and largest is a 69cm. The biggest problem with bikes this large is reaching the down tube shifters. This Schwinn has stem shifters, but in a way that is an advantage because it can be converted to bar ends cheaply.