$129 (nearly 75w channel with low distortion)
Both power the HE-500 easily, sound awesome, and can't be beaten on price/performance (There are $99 chinese OEM versions of the top one on ebay). They are much more compact than the Mini or a receiver as well.
I haven't heard the mini itself, but I can't see how it would be worth more than 2x-10x the value of these. The $20 Lepai is dead silent off my HifimeDIY Sabre DAC when no sound is playing.
Edited by bhazard - 10/8/13 at 1:11pm