I would start with a small focal ration and then work up to the long focal ratio's. The Vixen mount on sale (if it has not sold already) in the used section is a good one to start with. And it will let you start small and explore longer FL's upto 8". These usually have very low PE compared to the EQ6.
A Ed80, with the Vixen and your DSLR would be a good start. You can then work up to a GSO RC 8" or VC200L. And perhaps a Qhy8.
SPend more of your money on getting a good mount (Even with less load capacity) that has low or guidable PE at long FL's. Optics will come and go over time, but better to start with a good mount and short FL's and work your way up.
The EQ6 is a good mount but still suffers from high PE. This will not affect you for shorter FL's (if guided) but it will need some fine tuning to get it to work at longer FL's.
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