Thanks again to everyone for their thoughts and suggestions. Just letting you know that I finally went with the Sharpstar 100Q II and have so far been very happy with my purchase.
- Sharp to the corners, no aberrations
- Suits my FF 5D IV perfectly
- Connects straight onto the HEQ5 Pro with the vixen bar
- Connected my guide scope on the top rail
- Suitable weight for the HEQ5
- No need for flattener/reducer
- No backfocus issues
- The focusser is very strong and sensitive
- Bench tested and local support
- Great Focal Length for large amount of targets
Now all that's left on the current wish-list is a dedicated astro-camera, an auto-focus and some dark-site imaging time, hehe. Oh, and maybe a second rig, lol.
Here's some quick images, and of my setup.
https://imgur.com/a/4HV1KuM
https://i.imgur.com/MiP83em.png
https://i.imgur.com/6L74aWj.jpg
https://i.imgur.com/GlWDxFn.jpg