okay, so not exactly how much stuff costs, but here is another DIY, or more specifically b22, question. 
 
On thrice's b22 group buy page, he says: 
 
"You choose a gain of 2, 5 or 8 (remember in balanced mode the gain is effectively doubled. My balanced amp has a gain of two and my low impedance cans get to the 4-5 step on the attenuators; do not move to 5 or 8 unless you primarily use high impedance headphones for a majority of the time)." 
 
Lets say I were to be interested in a b22. My problem is my favorite cans impedance run the full spectrum from RS-1 to K340.  So how about this: will even a gain of 2 give enough juice to crank up the K340 or HD650? I don't mind if I have to really swing those volume knobs to crank the tunes, I just would hate to limit the performance of my higher impedance cans just to get a bit more pot swing for my RS-1 or W5000. 
 
Thanks again! D I Y = C O O L G U Y S