The pricing on the SVS subs is not as bad as I expected! But, it is safe to say, a XTZ 10.17 will be more powerful than a SB-1000 for filling your room.
Since you mention the movie bass/LFE experience as your objective, you need something to reach to around -3db at 20Hz; the 10.17 claims exactly that and the 12.17 claims -3dB at 19Hz. It takes a very good 10" driver to put out 20Hz and I expect the major difference between the 10" and 12" is how loudly they can produce those lowest frequencies.
I like the XTZ design because they are reminiscent of Hsu subs with the option of sealing one or two ports and three different EQ settings to further tune your sub to the room acoustics. I wonder if XTZ didn't use Hsu products as a starting point for their own design (it would be a smart choice)!
As for using your new sub Dali sub E-9 F, if you are using a program like Audyssey, I cannot be too optimistic that it would work well.
Here is the issue:
(I don't pretend to know exactly what Audyssey does, but the following is a reasonable guess!)
First you will need to manually level match the two subs - not a big deal.
Now Audyssey will treat the two subs as one and do frequency sweeps. Lets assume your Dali sub drops off around its -3dB point which is 37Hz, so Audyssey will see a drop off below 37Hz but still see response at 20Hz (from the new sub). Accordingly Audyssey will boost the signal below 37Hz to compensate. The new sub can handle this, but Audyssey is applying Kryptonite to the Dali Sub. One of the worst things you can do to a ported sub (the Dali) is boost the signal below its tuning frequency!
Since your objective is to get a sub that produces the frequencies below the bottom end of the Dali, any sub that accomplishes that will be problematic!
Also know that upgrading your AVR to Audyssey XT32 will not remedy this!