I've listened to M80 before so I guess M100 would share similar character. As SE846 has its new invention focusing on the bass part, whereas W serious are relatively leaning towards natural, therefore it's reasonable to suggest SE846. That being said, you may ask Danz 03 (from above) for his opinion as he own the SE846.
Or, you can wait until I get my ASG 2.5 in a weeks time then check my comment. However, the best way would always be having audition yourself and see, if possible.