Hi
A refractor or reflector is I guess a personal preference, but wouldn't the 120mm F/8 be pretty large to handle? focal length is 960mm almost a metre. I've been tempted at getting this scope myself but i've seen one of these in the field and they aren't small.
I'd say stay with shorter Focal length scopes, easier to manage, wide field of view. invest in one or two decent eyepieces as well.
As for mounts, you mention you want to use a DSLR. what type of imaging are you targeting? your mount will depend on that as it will need to track reasonably well. you won't be able to do planetary with a dslr, but they do widefield and dso well.
As a basic mount, an EQ3pro goto with a 7kg capacity is 749.
a 100mm F5 or F6 SW refractor would go well with this and may stay close to your budget.
This should provide basic imaging capabilities although the load needs to be light as its not very rigid.
Else look at the goto mount bundles. there are a few dual mounts that work as alt/az as well as equatorial so you can do basic imaging and works as goto alt/az.
The ioptron goto bundles with the 80mm refractor or the mak-cat sound good especially the e-mount that can be used equatorially, but do read up on reviews before looking at them.
A lot depends on what you want, so it'd be good if you could detail what you like to view both visual and image.
you'd need a mount with tracking capability for any imaging, else a sturdy alt/az would do. As others have mentioned, a sturdy mount is pretty important.
Good luck
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