Hey
You could consider the new range of ATH-IM iems from Audio Technica. They feature removable cables and theres a whole range to fit your preferred sound at great price points. There are 2 dynamic models, the IM-50 & 70 which have impactful bass-centric sound but still very detailed...very similar to the SE215s you mentioned but IMO are in a totally different league. There are 4 ba models the IM01-04 that are single to quad drivers, each with a very unique signature.
I went with the ATH-IM02s, which to my ears sounded the best of the lot...The most detailed reproduction I've heard in an iem with a huge soundstage and fantastic imaging. The IM02's in particular are picky when it comes to pairing...but pair perfectly with the X5 and sound fantastic. Although I'd give it to the Shures when it comes to noise isolation.
Check out more detailed opinions here http://www.head-fi.org/t/705687/review-of-audio-technica-ath-im01-ath-im02-ath-im03-ath-im04-ath-im50-ath-im70
Cheers
P.S. I also own the VSD3S and GR07, and since I got the IM02s I've not touched the Vsonics