I've decided to sell my SE535. As much as I love how neutral the bass is, or how well it fits, I think its upper-mid emphasis is just a tad too bright for me. Some people love that, but not me. If there was a tip that sucked out that 7KHz peak resonance, then I would totally keep it, as that would allow me to enjoy the SE535 without any EQ (though I'd still want to boot the 13KHz region for more air). I tried the different tips, but they don't seem to affect the sound as much as with something like the Westone 4.
Anyway, for those of you who are looking to get a SE535, here's mine for sale:
http://www.head-fi.org/forum/thread/553568/shure-se535-complete-package-barely-used#post_7464316