Hi Steven, My choise would be to go for the biggest mount you can afford or at least Justify. The HEQ and EQ5 mounts are good performers but are a little lacking in carrying capacity.
The EQ6, although more expensive, has a much greater capacity than the 5's and will serve you well for many years. If the use is to include Astrophotography or there is some chance of this becoming one of it's uses then it is a no brainer. The 6 will handle quite a large telescope and a guide scope together without to many hassles.
Remember that for Astrophotography it is wise not to load the mount past about 2/3 of it's rated capacity. It will handle this weight with ease and will guide very well at this loading.
Good luck with your choice.
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