The 127/1200 on that mount is a good decision for your observing goals.
However, there is no scope growth left in that mount, refractor-wise.
But you said you have set the firm budget so your choice is really good for now.
While astrophotography is neither on of your goals nor is it comparable with visual results, a search on Astrobin for that particular scope brings up these:
Astrobin Bresser 127/1200
And the 152/1200 on AStrobin
Astrobin Bresser 152/1200
Have fun!