I am not sure any of these tubes will work for astrophotography other than in afocal through the eyepiece. They may not have enough "Infocus" such that the DSLR or dedicated astro-camera will be able to reach focus .
I have a XT10 that I put on a non-goto EQ6 for visual. The tube is very long and even small gusts of wind move the tube. This is fine for visual but not ideal for astrophotography. Also the tube weighs about 35lbs with accessories so with a rule of thumb for astrophotography you would need a mount capable of about 70+lbs to use one of these tubes for Astrophotography later.
This or similar is what you want to do both visual and astrophotograpy. However, I would ask in the astrophotography forum for their advice for a Newtonian for astrophotography.
If you want the telescope for just for visual, I would get the First Light because the tube rings for the Dob will come off and on easily and you could swap back and forth between EQ and Dobsonian modes quickly. If you just want an optical tube assembly for Visual on the EQ mount, this will do but again it is not really set up for astrophotograpy.
FYI a big Newtonian on an EQ mount is not easy to use. My tripod is 30lbs, my mount head is 40lbs, my counter weights are 33lbs, my telescope tube is 35lbs, and my battery is 20lbs (150lbs total). It is a lot of gear for visual. The eyepiece ends up 7 to 8 ft. above the ground (you need a ladder to view). Even at its lowest the eyepiece is 5ft. off of the ground. If I change the part of the sky I am looking at, I have to rotate the tube so the eyepiece is in a better location. Once set up it is nice for tracking objects like mars or for studying DSOs for long periods. However, It is not an everyday setup!