Since there's more than one "correct" answers you should definitely buy them both.
Hifimanrookie ordered above mentioned BWs for his HE-500s and I ordered SWs for mine soon after. I'm still on the waiting list and what I understand he has not received his yet either. Anyway there aren't any HE-500 owners who would have both for comparison, this was asked a few pages back. So buy them both and let us know which you prefer.
Edited by LPP6 - 1/5/13 at 12:28am