I thought I'd post a brief update, with a longer review of all the headphones when time permits.
So after living with the HE1000's, LCD2, LCD3, HD800, T1's and the PM1's, I've decided to go with the HD800's with a Moon Audio Black Dragon cable.
I really enjoy the darker sound from the planars but after the PM1's causing me pain, I had to rethink slightly. In all honesty, the headphone that disappointed me the most - the HE1000's. They were good, just not as good as I'd expected, especially for $3000, they certainly don't "redefine" the industry as everyone thought they might. They were a nice balance though between the HD800 and LCD's, just lacking something to me.
In terms of sound, I did prefer the LCD's to the HD800 as I prefer a slightly darker sound, which the LCD's are renowned for. They were heavy, much heavier than my Oppo's and I had a feeling that was going to cause me issues down the line.
In the end, I love the soundstage from the HD800's, but was let down by the lack of punch from the low end. This is something I've been able to resolve with the Moon Audio cable, which honestly has given me exactly what I wanted, though it makes the HD800's far more expensive! I did however get a cracking deal on the HD800's from Germany, ended up being $600 off retail which basically paid for the cable.