Welcome
You say
it'll be called the Skywatcher 120 ProEd
The ED120 Pro is this
http://www.opticalvision.co.uk/astro...refractor.html
Which is what i have and I was told is too heavy with accessories for the HEQ5 if you want to stay under the 60% capacity of the mount, or do you mean this one
The ED DS Pro 120 EVOSTAR (I know they can be different names where you are in the world which really confuses me)
Whichever, nice scope, just remember to take into account camera, 2" diagonal etc weights