I ordered Version B (same sub as E). I'm told it will be an 8*8 sub, and yes I'm hoping it is comparable to the 10" one the were offering. Worst-case I figure I'll have the wiring and DSP and can always swap-out the sub later if I'm really not satisfied. Or maybe even try to find a deal on the stock subwoofer.
If you swap out the self amplified 8" subwoofer from HS and replace it with the OEM subwoofer, you'll need an amplifier to power it.