CG5 is dodgy since 90% of the time it is overloaded. It is an ok mount that can have lots of features if you download the latest stuff - but it s a very lightweight mount. Not really suitable to you C8 when imaging.
Tripod legs DO count for something. The CGEM and the CGEM DX have the same mount head, but the difference is in the tripod. the DX is much thicker and heavier - hence it takes an extra 5kg. I am using this as an example since both the CGEM and CGEM are well outside your budget.
Take your time in buying. The mount is the most important decision to make when you want to image. I took my time and I am very happy with my mount. I know one EQ6 owner who looks quite envious at my mount...
Keep your eyes open and second hand HEQ5 and EQ6 will appear from time to time.
