Thanks for the review, as I'm sure I'm not the only one wondering about the M1/M2 choice. The main problem the M2 has? The M(1), as it is a comparable unit for much cheaper. I'm sure CM will rectify by killing the M(1) though. As noted, the price overall is the biggest niggle. The flat, rigid cables and Bronze 80 Plus rating don't add up in my eyes, but these are just little things.
I'm curious about the lower power units though, as the manfacturer is apparently different, as in not Enhance.
Case: Define Mini
Parts: P8Z77-M Pro µATX, i5-3570K, N650Ti-1GD5/OC, 8 GB G.Skill DDR3U, Xonar DX, WD G 1 TB, mx100 256 GB SSD, RX-5300 PSU
Cooling: Noctua NH-U12P SE2 + Scythe SS PWM, 2x Noctua NF-P12
Extras: Eaton UPS, Dell 24" EIPS, Ducky TKL, SteelSeries Sensei Raw, Synology DS213j 6 TB NAS
idle-load: CPU 32-44 °C @ 300/600-600/800 RPM, GPU 35-65 °C @ 1200-1650 RPM