lol.. sorry was a bit confusing.. ahahaha..
then i said sound balance like sm3, i was more referring to the quantity of lows, mids, and highs, not detail or resolution. specifically i wanted to know what single dynamic driver, with open acoustic, that doesnt lack in terms of quantity, and have a good extension especially at the lower end. Iem that does 'complete' bass is something like vb or ddm, but vb is harsh and dry sounding, ddm is 2 soundstage position issue.
so anyway lets list out 5 of whats u think is smoothest sounding single dynamics that is not offensive, and vented.
I still don't think you're going to come up with a list of five. Let's see - there are only about 10 top-tier dynamics in total (that I've heard):
Radius DDM (which you've tried)
Discounting anything that's over your $200 limit or not vented, we get:
Dropping anything with significantly less bass impact than the SM3:
But I really wouldn't call the GR07 especially smooth. It is detailed, textured, and a little dry. Does have great extension, though, but really not an SM3-type signature.
I have not heard the final production version of the B2 so I cannot give a proper comparison. I would expect it to sound very close, if not identical, to the DBA-02, but of course noone knows for sure at this point. There was a good DBA-02 vs GR07 comparison in one of the GR07 threads if you're willing to live with that approximation.