Thanks for the replies. So many choices...gah! I certainly don't dislike the SF3s, but I've had them for probably a good 5 years and didn't do extensive research when I purchased them. I'd say they sound balanced, but lean towards hollow. They aren't warm, and certainly don't have a lot of bass.
Two other's I'd throw in to the mix after researching are the Brainwavz B2 and the TDK BA-200.
Ideal - full spectrum, clear separation between treble, mids and bass, with good noise isolation.
The B2 is not something I would recommend if you want at least as much warmth as the SF3. The BA-200 I'm not familiar with. If you do want a warmer, fuller, bassier sound compared to the SF3, I would go for the SE215 or GR07/GR07 Bass Edition out of your original choices. The SE215 isolates better but the GR07 is clearer and has quite a bit more treble energy.
According to Westone there is not (at least not intentionally). The W4 does not appear on Westone's site anymore so it seems like the W4R is the only extant -4 model.
Actually had the chance to listen to the B&O H3s today. I liked the sound. I think it may have been a bit heavy on the bass, but it sounded full. Definitely could tell it had a broader frequency than my SF 3s. Given name I think they are overpriced by 50-100$. I am curious to hear where others think the G07, AS215, B B2, Hickman 400, and DBA-02 MkII compare sound for dollar.
I haven't heard any B&O headphones.