A late reply to the post by hpamdr regarding the auto shutdown annoyance:
I posted a hint plus short review "How to defeat the auto-off feature of the SMSL M8" on Amazon last month. Holding the power button down for two seconds will toggle this feature, and it is remembered between shutdowns. The M8 will power on if you disconnect/reconnect its power source, but turning off auto-standby renders this unnecessary. I also mentioned a BIOS feature my motherboard has, which can optionally cut power to two specific USB ports for externally powered DACs, such as the SMSL M8.
I am currently awaiting shipment on an iFi iPower variable output (inc. 9V) "audiophile" AC/DC adapter - not a Linear Power Supply, but supposedly has lower noise than a LPS, according to their website - http://ifi-audio.com/portfolio-view/accessory-ipower/
It's around $50 from MusicDirect.com, but shipment estimate is 4-6 weeks. No word yet, and tomorrow is the 6-week mark since my order went through. I'll give it another week till I contact them.
[EDIT: Just got word it shipped today]