I also take interest in an inverted motherboard installation. I believe it is better for the CPU because the hot air from the graphics naturally goes up & does not get sucked by the CPU fan.
As for cable management, it appears that the outlaw have places to hide the cable but the fact that the 24PIN cable which is thickest & the hardest to shape have to make a long crossing with no place to hide which makes it difficult as opposed to normal oriented cases.
A look at this page gives a view that cable management in an inverted case does not look appealing at all. http://www.legitreviews.com/article/1750/5/
The merc alpha on the otherhand looks fine but a little tight at the back. But I see that Antec is the same. The Merc Alpha at least have a bigger place to work with within the case itself.http://www.anandtech.com/Gallery/Album/1436#5