M3's are not too bright at all. Bright is usually another word people use for forward which the M22s are accussed of being, both bright and forward. The M3s I would suggest as being neutral, laid back, as the vocals are a little recessed from the lower tones and mids.
Best way to know for sure would be to look in the Hearing Things forum and in the post at the top is a list of people willing to give auditions. I know there a number here from your area, so you should be able to get an audition.
I haven't the EP350 so I will leave that up those that have.
