I run M80s and VP180 from my AVR without any issues. The levels at where the amp start clipping are higher than what I can handle for a long period of time. For example, on most BD, the amp will start clipping around +5 on the dial and usually when I want to watch a movie loud, I watch it at -8. Keep in mind my room is fairly small (20x11ft). If your room is big and you listen loud, then you might need separates. Try it fist with your current AVR and see how it goes.
And yes, the 180 is a huge improvement over the 150 (in both size and performance
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