In that case then,
3. Probably.
Haha honestly it's just an all in one dac/amp solution. It'll be powerful enough to power the headphones you have now and will most likely power the 600ohm versions of your headphones too. There are tons of reviews of people using an audio-gd fun/sparrow with the 600ohm phones that don't have a problem with it.
If you haven't already, go take a look at the NFB-12 thread. Audio GD has had a TON of orders to fulfill and are backordered like crazy. Not only that but they have a national holiday coming up that will make the wait even longer. The people who ordered before December 31st were supposed to get their shipments delivered out before January 28th but unfortunately even some of them will have to wait until mid February for it to ship out. It's safe to say that unless someone who has one is selling it, you probably wont be able to get one for at least a month.
I can tell you that the Nuforce HDP is a great dac/amp combo but it seems like the NFB-12 has it beat in almost every area on paper, the same goes for the e7/e9 combo too. Not only does the NFB-12 have a better DAC than both those units but it also has 2 of them. I know I'm getting excited for such a low price budget piece of gear but this thing, especially for the price, is unlike any other offering out there right now.
