Non-fatiguing, balance, <150 - the PFE012s might have a little more crispness than you might be used to with the Shures, not fatiguing to these ears but depends from person to person. Not to mention they are relatively shallow-insertion and can't isolate much. I'd still put my bet in for the IE800s, add in the BA200 if you can handle a little less bass in exchange for smoothness and non-fatiguing treble up the wazoo. Also isolates quite nicely.
if you want to go for the BA 200 check it here. much better price than amazon UK. ships to UK checked it
Very tempted by these now. I'm very happy to have a more balanced sound signature than the SE215's, and prefer sharper more responsive bass than looser high volume bass.
That link works out as £86 for the BA200's, that's only marginally more than the SE215's!
Edited by Kreeeee - 5/4/13 at 6:30pm