Why..............................................you...................................
Well, I am an advocate of RBH & Denon/Marantz, but I certainly don't represent everyone here.
I only express my experience, which includes owning the Def Tech BP7000SC tower, which I liked a lot. I do like the sound of the Def Tech and Golden-Ear towers with built-in subs. But even back then when I owned the BP7000SC, I did not like their implementation of the built-in sub amp at all. If they could make the amp external on those built-in subs, I might be more inclined to be more neutral.
I think many people have angst concerning buying speakers unheard. But after buying all the speakers over the years, I am very confident based on speaker measurements and the basic design of the speakers - the more flexible the design, the better. And I believe the RBH SX-8300 is more flexible and measures more accurately than any Golden-Ear or Def-Tech speakers. The RBH brand also commands a lot more respect for several reasons. I already mentioned accurate frequency response measurements and flexible design (the bass can be easily actively bi-amped using external amp). They are also made in the USA (RBH have been making speakers in Utah for over 30 years). It doesn't hurt to have a big brother speaker like the $50,000 Status Acoustics 8T towers either.
And just as importantly, I can get the RBH for a much better price than any Golden-Ear or Def-Tech.
So better price, better measurement, more flexible design, more prestige = clear choice to me.
Oh, yeah, almost forgot- same thing on the Denon X4000. I mean you could get this awesome AVR (Audyssey XT32 + dual independent Subwoofer EQ) for about $900 if you know whom to call.