Can anyone recommend anything? Thanks!
GR07 in my opinion are a good option. Not quite as big a sound stage but no IEM will achieve that, not even the Senn IE8 but the overall clarity of the GR07 is very good as is their instrument seperation. On that note though the IE8 would also be a good option in terms of overall sound signature as they will be dark like the 650 and will also have a similar midrange.
Just noticed another poster mentioning the 650 as being bright and neutral. My experience is they are actually on the dark side (not super dark just darker than neutral which is also how I found the IE8. The GR07 on the other hand is much closer to neutral with only the slightest hint of warmth in the midrange and bass that goes very deep in the sub-bass but has little to now mid-bass hump, and treble that I find much more appealing for cymbals than both the Senns.
But this is just my opinion and not all will hear it the same as I do.