For $100 or less there are some other great choices:
1) Schiit Audio makes the Fulla 2 ($99), it is a desktop DAC/AMP that is way more powerful they most things in this price range and size.
2) Fiio EO7K ($70) Similar to the Fiio E17, just the "older" model so you can save some money.
3) TOPPING NX2 ($35) Powerful and portable, with good battery life.
4) Creative Sound Blaster E3 ($90) Portable and a well known name. All depends on who your...