I would just buy a cheap IEM for trance. Trance is horribly mastered and mixed and high-end IEM's will expose their bad quality. Something like a Shure SE215 would do fine.
But if you want to spend big money, the Shure SE846 is very good for trance. (however I don't think trance music is high quality music that deserves high quality IEM's)
I think that's a hugely unfair generalisation. Just as many producers will put a lot of time into mastering and production for trance as others would for any other genre. As with anything, there is well made/mastered trance and badly made/mastered trance. The same applies to everything.
One thing that might go against trance is that it's often on compilations with other forms of music. An example might be Andy Moor's new mix, 'Breaking the Silence- Vol.3.' It's a mix of house, trance and a little dubstep, and it's mastered very, very dark. the dark tone suits the house and dubstep well, but the trance (which unfortunately makes up ~75% of the album) just doesn't sound quite right through a lot of systems.
I don;t know if you're just not a trance lover, or whether you've had a bad experience of things like the above, but it's no worse than anything else you could name with regards to production values.
And just to be facetious, the SE846 is usually more than $700 ;) I set that budget because most 'phones over that are great at every genre under the sun ;)