The Halo 1 xbox was released in 2004, and the Halo 2 Xbox was exclusive to Canada and Asia, so I’m not so sure you can really count them.
As for Halo 3’s, that was to celebrate the end of a trilogy, and Halo Reach’s was in celebration of both the new 360 Slim and the final Bungie-made Halo title.
Honestly, I would prefer 343 hold off making another Halo Xbox until Halo 6.
I had the Halo 3 Xbox, but it fried :(. I’d like to buy another Halo console. Cause I still have an Elite from the 2009 Fall Halo 3 bundle. The console bundle would have to include an awesome console design, controllers maybe like the Halo 3 ones with the artwork on them, and the Limited Edition. Nothing less, nothing more. But I don’t understand why they would have a console bundle and not a LEGENDARY EDITION, if they did that, that would be a -Yoink- move.