[Entropy]

Hey guys, been quite a while since I've posted on here, but I'm back
Looking at buying a new scope, specifically a takahashi that marrys well with the sbig stt.
Also would like it to sit on top of an eq6 with the Orion autoguider.

My question is, what is the difference between the TOA-130NS and the TOA-130NFB?
How does the NS compare to the FSQ-106?
With the 25kg weight limit and the 12 odd kgs of the NS, will I be overworking the mount for astrophotography?
Cannot find a comparison on these two scopes anywhere.

I eventually want to upgrade my mount but not for a year or two.

Any suggestions would be much appreciated.
Thanks guys