Not sure if the E17 will have enough power to drive the HE-400s (they're planar-magnetic, which usually means that they require a pretty powerful amp). The SR-325s have very bright, sparkly treble, and can be too harsh for some people (like me). If you can audition them first, do it - they're a love 'em or hate 'em headphone. The K701/702 are very revealing, which may be a problem if you listen to lower quality rips or poorly-mastered recordings, but if you don't then they might be a good option. $400 is pretty steep for them though - they're under $250 in the States.
The HE-400s are also pretty different from the other two, which are more treble-focused. The HE-400s are apparently quite bassy, so if you do decide to get those, just be aware of that.