The M2s are going to be closer to the M60s than the M3s are. Likewise, the M3s will be closer to the M50s.
My room also opens to the kitchen in back and the hallway midback, and the Qs work just fine, so if you can work them in, I'd recommend them.
I have a pair of M50tis (2 generations back) and frankly, they can't hold a candle to my M80v2s, nor to M3v2s that I have compared to them. I've heard M60v2s, but not in a direct comparison to the M50s, but I still think the M60s are a big step up. That said, it's possible that the M50v3s are also a big improvement over what I have.
