The DM8000 is the best box you can buy. Its well built it has great software support i.e, plugins images etc. Its very stable and it dossent get too hot unlike the Dm800.
Azbox is well built but the soft/firmware is buggy and limited ie, plugins etc.
I have had many other models of Dreamboxes, the Dm8000 is the only one that i have been happy with interms of reliability and picture quality. The one that came close to it was the DM7025, but what let it down was its lack of DVI or HDMI support.I know the DM8000 is expensive but in my opinion you get what you pay for in this world.