10 years ago, I picked up an REI Kilo plus. 800 fill, 2.2lbs 0 degree and compresses really small. It still serves me well to this day. I recently picked up a Mountain Hardware HyperLamina spark 32 and just sleep with a puffy, etc when it gets cold. I've found that the 32 degree is more versatile over a wider range of temperatures. For a synthetic bag, it actually is lighter and compresses better than my down bag, but noticeably not as warm. Full on winter-friggin cold, I'll roll with the 0, but overall the 32 is a better fit to my style. I roll around a lot and tend to sleep on my side and overall I am more comfortable in the Lamina with a center zip
Of your listed options, I'd probably take the Igneo.
http://www.mountainhardwear.com/hyperlamina-spark-35-regular-1568251.html