ok, i have looked extensively into this ken and it goes like this:
cg5 = eq5 with goto. its celestron made. good for a max of about 7-8 kg if i remember
heq5 is a much heavier mount that the eq5. it takes up to 15kg if i remember.
heq5
pro is heq5 with factory installed goto.
andrews can also install goto into heq5 for less than the heq5 pro.
as for eq5 i havent looked into this too much but i am guessing that as previously stated goto can be put on it.
if you can afford the heq5 go for it. its a much more stable mount
