I'd agree with that, the 600's are more of an audiophile hp than the more 'fun' 650.
Must say as well... It is infact pointless trying to fight the urge not to buy the HD800's. The seed is already there my friend. And it will stay there, growing in the back of your mind until it strangles your reasoning. Then one day with an empty look in your eyes and empty house (Wife not in) you will order them. Then for the next few days you will feel a mixture of guilt and high expectation as well as an almost sexual excitement as you keep checking the tracking information. When they do finally arrive, your hands will 'shake like a sh****g dog' as you unbox and then hold them in your mortal hands... They don't sound too bad either.
But you will probably keep your HD600's as well. Like I did. Because they do some thing's... 'Differently'.
Oh, you have no idea. Until recently my office was across the street from J&R, that's where I got my HD600's, over the counter. I stared at the HD800's and remembered the sweet sounds coming from them the last time I listened to them at J&R. I knew better than to listen to them again, at that moment, and left with the HD600's and staying within budget.
Alas my office has moved across the river to Jersey City, a brief journey to J&R via the PATH Train or by ferry. I must resist the temptation to swim across the river and fetch a pair. Eventually I'll cave in, hopefully I'll take a dry route as I wouldn't want to get the new babies wet.