The 105 is a great machine--but far from cheap.
You will have to match it with cans it will drive. It certainly won't drive the HE-6 (few amps do). Further--as much as I like it and the HE-500, their sound stages is too small for your purposes.
If you have sufficient interest, I can try my 105 with a number of cans (including the HD 800 and T1) and let you know how well it powers them. When listening to movies, I usually use the AKG Q 701--because of its large sound stage and long cable that comes with it.