I am getting 100m transmission in my house (plasterboard walls ) with my Sennheiser RS220 headphones, great for practising drums to favourite songs on You Tube

Someone is good with photoshop I think - I just received my Sennheiser HD800 last week and have been breaking them in over the past few days on differenty types of music and with a few headphone amps I have - they are lighter than I imagined, though still a bit combersome, but the sound quailty...

How about a Graham Slee Voyager? Battery powered and sounds pretty good from the reviews I have read?

I also had HD650's for over 10 years before upgrading to Sennheiser HD800 headphones. Whilst the difference is not night and day, the HD800's have more detail and greater control in comparison - and much more cool and comfortable to wear for long periods .