The options at the moment are SE535 Special Edition or the SE846. I read the entire SE846 thread. The initial impressions reported that the SE846 didn't have as much bass as they promised with the True Subwoofer. It also appeared to have a lack of instrument separation. The entire sound image seems to be 1 blob.
I'm willing to go for the expensive SE846 if it truly delivers what it promises, but I'm concerned about the issues that have been reported so far. The SE535LD seems to be a SE535 with the addition of highs and lows, which the regular SE535 lacks.
Should I choose the SE846 or go safe and buy the SE535LTD Red ones? I know there are "better" IEM's for the price of SE535LTD, but in the reviews of those alternatives, I always read that they are very neutral. I like the forward mids of the SE535.
My last option is to go custom and get Ultimate Ears, but I'm not sure if the sound quality is drastically better than the SE535. I'm already satisfied with the fit of the SE535.