You can get belt drive kits for the NEQ6Pro and the latest version of Synscan has some good enhancements related to polar alignment without Octans and error correction. (V3.35).
I run a long refractor (127mm, f12, 1476mm fl) on my NEQ6 and its rock solid. The HEQ5 might be too small for your rig, if you go by the rule that a mount should not be pushed beyond 2/3rds of its rated capacity for imaging.
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