Haha, I'm not an IEM guy because my ears hate them— I use them as earplugs I can play music out of every now and again because my commute can be noisy as hell and I already wear my ears out from using headphones, so they're a necessity more than anything else (doesn't mean I don't love trying TOTL ones out, mind). That said, pending input from people who actually know crap about IEMs, what I will recommend is that you learn about the SE215's sonic profile so you have something to base future purchases off of. I remember trying the 215s years ago but don't remember what I thought about them; measurements from @La Cenric here and InnerFidelity here (not to be confused with In-Ear Fidelity, which is a cheeky-ass name that actually made me laugh) show that the SE215 has a v-shaped signature, which means it's got more bass and treble than midrange. This can give a fake sense of "depth" to stage that some people might like (cough cough), makes every song sound more "exciting" too. It's not a good signature for every type of music, but I can see why you'd like it for those you listed. I'd recommend going for something a bit more normal-sounding if you ever want to listen to basically any other genre, but if you're sure you're sticking with those there are worse signatures I guess. I've tried some nice $200 or so v-shaped IEMs that I could recommend, but that isn't your price point so I'm abstaining, haha. Maybe if you ever get a $7k budget and can travel to Japan a few times you could go for the Just Ear MH1 and have a professional make a bespoke pair just for you, not just in fit but also sonic tuning. The whole thing sounds a bit ORFAS to me, but I'd be lying if I said I wouldn't be interested had I the cash. I remember there's a manufacturer in the USA that does the same thing, lets you determine how you want your CIEMs to sound, can't remember who that was. P.S. I grew up listening to Linkin Park, and have very vivid memories of the sheer cathartic joy I felt at 7 years old when "One Step Closer" on MTV dared scream "shut up" with my parents in the room. I lost interest around the time MtM came out but got back into them with ATS— love their entire discography now, even MtM. I cried with what happened to Chester B., that was a tragedy.