Maybe I can provide with a few helpful details? Two months ago I bought the older version of MonitorAudio Radius. The system is: Front 270 (floorstanding), rear speakers Radius 250, center Radius 250 and the new SW called 360HD. It was an offer with 50% off the price as to sell out before introducing the HD serie. Due to some problems with items not in stock as persumed I actually got the center 250 instead of the 225 and the 360HD SubWoofer instead of the old one.
To me itïs an excellent system both for home cinema and for music. Some peope would find it a bit weak speaking of bass-response used as a two way stereo (analog direct to the frontspeakers). Combined with the SubWoofer its perfect. Clear sound, very pure and you hear no distorsion at all even when forced to the maximum. It wil go just fine with your Yamaha RX-V1900 reciever (RMS 130W) and the speakers 100-150W depending on the type. My experience is that the Radius speakers need a little more volume to make the best of it.
Donït really know if the new HD series are much better. The dynamic range is increased to 55/50/48Hz-35KHz (old ones: 55/50/50Hz-25KHz) concerning Radius 225, 250 and 270. The Radius 90 likewise 80Hz-35KHz from earlier 85Hz-25KHz. I need someone to tell me if this has any significant impact on listening. Your reciever only manages 20Hz-20KHz and the human ear has a limit around 20KHZ, decreasing when getting older.
The R90 speakers are probably very good but lacks a little in bass. Depending on how to use them ( in my case also playing 2xstereo front and rear) you will get most from the 250 set. I know nothing about the AW 12, but would say that its close to an overkill with 500 W continous Digital drive in this set-up?