Try to listen to some before buying. Also, try to listen to other offerings such as the Westone IEM's and the Super Fi's ... both of which I've read favorable things about. I personally would love to spend some time with the Westone UM2's ... but haven't had the chance yet.
That being said, I found some [a lot actually] SE530's on ebay for around 300$, do SE530's come with serial numbers, so I can call in and verify they're true SE's? I've owned super.fi's in the past and they are very uncomfortable, their tips are horrible, but the isolation and SQ is amazing for the price [got mine for 60$ new]. I don't want the super.fi EB because I read they poke far out, and I don't want the rubbing my motorcycle helmet.
Bass Slam = Me, I want it in my face, thick, and warm.
I take it the SE's are your only def suggestions.