Recommendation - Ref 3a, GMA, NHT or Fritz?

Hello, I sold my PSB Gold i's after 10 years of enjoying them. They were just too big for my space. I am now in the market for a pair of monitors (new or used) for my 2 channel system in a 12x12 room. My system consists of a Spectron Musician II Hybrid amp (Digital amp @ 500 WPC), a Prometheus Audio Passive Volume Control, an Audioquest Dragonfly DAC and a Macbook Pro playing lossless music files. From reading reviews and forums here, I believe I've narrowed it down to four monitors. Please let me know if you have compared the following against each other, and which monitor you'd recommend: Green Mountain Audio Rio Chroma, Reference 3A De Capo i, NHT Classic 3, or Fritz Carbon 7?

While I'm not the best at describing my listening priorities, a wide soundstage, clear, neutral sound is what I like. I listen to an eclectic mix of music, but Jack Johnson, Dave Mathews, reggae, classical are some of my favorites at the moment.

Thanks!