performance is of least concern with Atom. It's main focus is on power consumption and die area. Personally I think the pricing of the atom combos is absurd for the abysmal performance it offers. Atom exists for mobile or low-power, task specific non-multimedia systems. Atom is terrible for flash video playback and probably loads pretty high with MPEG4 as well. It's main purpose is web/email/word processing and other basic 2D productivity apps. at least you have the IGP to do all the dirty work with your movies.
one thing i can't stand is that the zotac board only offers two SATA ports, which means you can pretty much only have an optical drive and a hard drive, or a pair of hard drives and no optical. They never figured you'd put it in a case with room for more drives. this is an irritating limitation because, in the event that you actually are building an Atom system (go figure!), it would be nice to have file server capabilities as a secondary objective, yet they've ruined that by only giving you two plugs.