IM02 are fantastic, though maybe not particularly Grado-like (though my experience is mostly with old MS-1 and iGrado). I haven't had them for a while (didn't fit me well), but thought they sounded fairly open by IEM standards- problem is very few IEMs have an open/out of head sound, at least in my experience (more than other aspects this is supposed to be one of those properties that can vary quite a bit from person to person). For instance the fx850 have a very nice soundstage but are actually open... if isolation is not an issue they might be a good fit (maybe 3rd best I have heard for openness behind Ocharaku Flat 4 Nami, and Sony EX1000, neither of which isolate much), though do have strong bass and kinda v-ish.
The sony EX1000 (divisively bright) has a more neutral/monitor tuned & cheaper version called the ex800st (or 7550 for western model) that might share it's presentation, I can't confirm, though might be worth reading about.
I haven't tried them but the Havi B3 models are reputed to have very impressive soundstage, also seem fairly divisive and have a reputation as being difficult to drive, though.
Final Audio's Heaven series has a good soundstage reputation as well.
Lear's new NSS earphones have a dual-driver feature that is supposed to create a binaural effect by feeding part of the opposing channel into the second driver... haven't read up on them since they came out so idk how well that actually works.
On the budget front, I just got some JVC HA-FXH30 and they're really terrific all-rounders, have gone really well with the rock, vocal electronic (like Rudimental) and classical stuff I've tried so far, definately an "in your head" sound but decent stereo imaging/whatever, decent bass, mids & treble energetic but have nice clarity and texture/detail I think would go well with trance (don't listen to a lot of that, though I did have some random youtube autoplaylist thing going for a bit and it threw some Armin van buuren in), have noticed some slight peakiness verging on sibilant "ch" and "ss" on two or three vocal tracks though, if that is a sensitivity. (warning, I may be having a bout of New Toy Evangelical syndrome or something...)
If you are washing machine prone, maybe get some Aurisonics Rockets... titanium, waterproof, strong cable & jack, warrantied for 5 years, sound great (neutral-ish warm sounding imo).