Just my 2 pennies... No matter how many mods I made to my t50rp/t20rp, I could never get the sound I got from my HE-4. I revist my modded Fostex can every now and then, and I always feel the bass is missing. BMF ended up building me a DBV#3 on a trade last year, and he reached probably the flattest response I've had the chance to hear. That said, I never did hear the bass response everyone touted. Ultimately the modded drivers need the volume cranked to ear bleeding levels for me to get any true bass (and it just never gets as deep or punchy as my HE-4 or even my HD800s).
I do not regret the countless hours I spent modding those headphones. But, in the end, now that my free time is nearly non-existent, I'd rather buy the sound that I want up front without the need to tinker later.
One of the most satisfying audio purchases I have made was the HE-4... If you decide to go down the slippery T50rp path, just be careful, time sneaks away very quickly. I found I was no longer listening to music, but listening to mods.
Sir, I truly appreciate this advice. I've read many many of your posts and honestly respect your opinion. So, seeing as, the he4 is also the ONLY hp,so far, to just...wow..me. what am I supposed to do for a closed back? That's really the only reason a wanted the t50. Maybe these 262s will defeat that though. You see, the he4 is damn near a speaker, and I have a 15 month old, and one on the way. So, I need to find a quiet closed solution. And man, once again, Thanks for the response I have a lot of respect for your sacrifices.