HOB overflows work but they are restrictive and sooner or later you will have a disater. I only say this because I have had lots of experience with them. Some HOB's will allow you you the room to put dursos in but they can be restrictive based on the setup.
I have one 1" durso on my 265g and its is great and quiet. 1" will flow more than is stated by most website bdepending on how its set up.
feel free to PM me and We can disuss in more detail. I will tell you the problems I have overcome and how and the things to look out for.