Why would you want two 8" aperture scopes? You can reach nearly identical focal lengths/FoVs with your BS 8".
C8 or Meade equivalent is f:10 at +/- 2032mm.
Your BS 8" is f:2.8 at 568mm.
Remove the ASA corrector and it is f:4 at 800mm
Add a 2x barlow and it is f:8 at 1600mm
Remove the 2x and add a 2.5x Powermate and it is f:10 at 2000mm
ALMOST identical to the C-8
Hauling a barlow around is a lot easier than setting up another scope that will basically do the same thing at exactly the same focal ratio.
The 9.25" adds about 350mm of focal length over the C-8 for improved scale on small subjects like galaxies. But using a 3x barlow OR the 2x barlow ahead of the diagonal will allow your BS 8" to work at 2400mm at f:12. You do have options.
Or, better yet, if your mount will accommodate the increased weight, the C-11 would give you even better performance for these tiny targets. Albeit, at increased size & weight.
When Gavster reduces his C-11 for a brighter image, he is also reducing the effective focal length. His 11" aperture is always going to gather more light than your 8" BS, but you might be surprised what your 8" will actually reveal when used at the longer focal length.
If the C-11 is too big and heavy, there is also the Meade 10" LX200-ACF f:10 at 2500mm, which is 26 lbs. Just a thought!
Concerning your question: "For visual use with NV, is the HD better than the XLT?"
I read a post by Don Pensack (... might have been in the AP forum) and he wondered why people who were not concerned with AP were buying HD's. You will find that the regular SCT .63x reducers are a LOT less expensive than the HD reducers, and the XLTs are mighty good scopes with a proven track record... and tons of AP has been done with them in spite of inherent curvature. There are always solutions if you decide to start taking pictures.
Another option is one of the medium sized RC scopes in solid tubes which generally start at f:8. The advantage of the flat field and permanently mounted primary is significant, they don't employ a corrector plate so cool faster, and because they are made for AP, they will fully illuminate the NV sensor. You have options. There are always tradeoffs, but reaching your goal can be done in different ways.