I almost envy your confusion! Really!!
I enjoy the heck out of my speakers-but all I do now is listen!
The research however, was a Real Hoot!!
So take your time, think it out clearly, and above all, have fun!!!
And when you've finally made up your mind, buy your M50s from the FO!

Seriously-keep going, have fun, keep us involved and remember, were having fun right along with you!

Happy Hunting!!
Rich.