Monitor Audio Bronze BX5 Series vs Mordaunt Short Aviano 6

Hi friends, I hope you can help me to make a better decision. I am going to buy my first 5.1 system and I still don't know if my choice is right. I am gonna put it in my living room which is around 22ft x 22ft. I am looking at Monitor Audio Bronze BX5 and Mordaunt Short Aviano 6. And I am getting the Onkyo TX-NR609 for my The AV Receiver. Does anyone of you have similar combination? Or should I look at other alternatives? Any ideas? Frankly speaking, I prefer Monitor Audio speakers.