[heeeraldo]

...and now I'm wondering if I should replace them with another pair, or try out something else:
 

1. I'm using them unamped out of an iPhone 5S, with the three-button mic cable,
2. musically I'm all over the place; see http://www.last.fm/user/heeeraldo for an actual quantification of my listening habits,
3. I wasn't unhappy with the sound of the 535s,
4. I don't have a firm budget, but I'd like to keep it under $300 Canadian (which is about $240 US right now.)
5. I used them mostly during my transit commute, so the isolation was super handy.

 
I think that should be a good start; thanks for looking and feel free to ask more questions if it'll make for better recommendations!

 

[SteveHiFi]

Sorry you find yourself without the SE535 - ouch!
 
What would you change if you could alter the SE535s? This will give us a good guide as to what to recommend.
 
You weren't unhappy with them, but were you happy?

 

[heeeraldo]

good news! I found them! I don't need to either buy a new pair or find equivalents (and that's a $700 relief, since I'm in Canada.)

 

[billybob_jcv]

Yeah, but now we know you have the money to buy another pair of headphones - and you've already done all that shopping...

 

[heeeraldo]

I mean, it might be worth attempting the filter mod on them, but aside from maybe more soundstage and a bit more presence on the top and bottom ends I'm pretty happy with the sound I'm getting.