@ OP, yes I knew you were joking.
But..it applies to this situation more than you may realize. =/
- I think Zombie X broke it down for you perfectly.
- Whoever said something about the E9 and comparisons to higher-end amps, that was the thread by Milosz last year (or the year before?) on fast-A/Bing an E9 vs. a Beta22, a M3 and some other amps. It's worth checking out.
- Whoever said something about power and a beta22, what kind of power are you referring to that benefits the HD650? The beta's "power" comes into play with low-imp phones mostly, I would think. Something like LCD-2, etc. For the HD650, an excellent OTL would also give it what it needs in terms of juice (more voltage swing). It could still be just a few hundred milliwatts - take the Zanadeux for example, just 650mw into an HD650/600 load.
What do you mean different types of balanced amps?
Just different types of amps. Eddie Current Balancing Act, DNA Stratus, a bunch of other high end headphone amps.
I will agree with one point though, however. There are some budget-mid fi amps and DAC's out their that really do push the HD650 to about 85%-90% of their potential, and that includes some of the stuff from Schiit and Little Dot.