Check out the Arcam irDac (lots of reviews are available via Google), Essence HDACC and JDS Labs Objective 2 or Gustard H10 amplifier. Both the JDS Labs O2 and Gustard should be powerful enough for the 702's when watching blu-ray's while the Aune is not, and I doubt the DAC Magic Plus is either. The Aune is meant to be an all in one for those with DSD files and no speakers since it lacks a pre-amp.
Choosing a DAC and amp is difficult since very, very, very few reviewers test a broad range of devices, and because of the subjective aspect. I purchased the S16 first because I like the way it looks, but ended up with an Essence HDACC since the S16 I had didn't always work properly. I just discovered that Amazon US is selling the Sony UDA-1 for 460$; the UDA-1 is a steal for that price since it too can play DSD files and has a very, very powerful amplifier. A relative purchased the Sony was on sale for 500$ in Canada (where I live; the Sony is 800$ after tax normally) last May and let me test drive it, hence the recommendation, plus reviews are very positive. I purchased the HDACC since I wanted more inputs (two optical), a remote and a unit with a built in pre-amp for speakers, but I would definitely start with the Sony UDA-1 since it is cheaper and can be easily returned to Amazon if you live in the US.