I've actually owned the HE-5LEs twice. I think it's hard to get some of the detail of the HE-5LE, unless maybe the exception would be the GS-1000(i) series. I haven't heard the PS-1000, so I can't comment. The RS1i has detail, but the upper frequencies are quite "polite". They're there when you need it, but then they don't honk at you when they're not needed. Being that an orthodynamic headphone is quite a different beast, it might be awfully hard to chase down a headphone with dynamic drivers that can compete on the same level of performance. The drawback on the HE-5LE, though, can be the weight at times because they really approach the "ear speaker" level, to a degree. The ortho headphones can get you twice, though. Once when you buy the headphones because the cost will be slightly more -- depending on which dynamic driver based headphone you compare it to. Then, you have to get an adequate amp to drive them. This eliminates about 90% of the amp market. However, most amp makers (read: Schiit) are responding quite quickly to the newer demands of the orthodynamic headphones.
The HE-5LE can be quite a cliff hanger of a headphone. You can get so close to perfection ... yet, then question yourself if there's something else out there that could give just a little more. After going through 9 HifiMan changes, I realized not just one would make me happy. I'd need about 3 of the models to do so. That is when I said I'm heading back to Grado for a bit. The RS1i is quite the dreamy sound. In fact, the sound is nothing like I thought it was going to be ... but, it is 10 times better to my ears and what I hear so I can enjoy.