Hey Tony,
I have put a fair bit of thought into them for my new tank aswell, all said and done, i went to external.
The reasons for this were, Aesthetics...a big one.
-It can be a much bigger overflow externally with more overflow capability without the eyesore.
-no blocked lighting into the tank...and less algea in them, though that is an assumption on my part...havent quite got water in it yet.
-Increasing usable tank space is always a bonus, aswell as added volume.
Not sure if this is an option for you, but for mine i wasnt worried about weakening the tank`s back wall, if you decide on a "tank length" overflow (just the bottom of the box will work aswell.).... the bottom of the overflow will become a perimeter brace.
Marc.
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