Caveat: My personal opinion only
I don't think the Dragonfly can power your cans to its full potential (see edit below.) Unfortunately, your FiiO is not cut out to do the job just based on specs on paper. I could be wrong, however. Best you try MG1's unit. I'm using my OE Dragonfly (let's just call it a white label knock off) with my KEF M500 headphones but I'm not looking to have my ears and audio senses caressed by harps played by heaven's angels or anything. For what it's worth, my KEF M500s are rated at 32-ohms ±15%.
Edit: I see your headphones are rated for 470 ohms. Jesus haha Both the Dragonfly and FiiO won't cut it

The Dragonfly is good up to 300ohms, which you may hear a difference, but your headphones won't reach its potential. On the flip side, I don't know how loud you listen to your music, so it won't really matter. Nonetheless, you may want to consider the IFI Audio XCAN to take full advantage of your headphones, and coincidentally sold at the same store MG1 posted, and is on sale!
@MG1 - thanks for the offer, but I'm in Toronto (Centre of the Universe.) Given that we both grew up in the same neighbourhood and its reputation, I probably won't send it back to you