I did some more tests and have come to the conclusion that even the 350 is overkill for that size room. I ended up ordering an ep175, I think it will be the perfect size.

On another note I alternated between my M3s and M60s and without the subwoofer there is a big difference. With the subwoofer (I used the ep350 for the test) , they are so close. I guess with a good subwoofer you really can get away with bookshelves.