Good to see the 5LE's are still receiving some appreciation here. Not sure why they were discontinued either. Besides the HE-5, which had the wood cup splitting problems, I don't think any other Hifiman cans were discontinued? The HE-4, 300, 400, 500, and HE-6 all seem available. Which brings up another observation: For awhile, Hifiman seemed to be cranking out the models in quick succession, but it's been quite awhile since they've released a new model. Wonder why that is. . .
I use my 5LE's with the Hifiman EF5 hybrid amp or through vintage receivers (sometimes headphone out, sometimes speaker taps). While they do require a lot of power compared to may other cans, I don't think you need to spend a lot to get them to sound really good.