In my 8" f6 the most commonly used "high" power lense would be the 9.7mm (123x) so I would add a vote for the 8mm (94x) in your scope. I use other shorter lenses only when conditions allow and commonly on the moon but most other objects cannot often support the extra magnification.
As for the choice of expensive wide angle lenses, that may need consideration as you have tracking with your GEM so maybe a good plossl lense is all you need. This would allow you to get some good lenses at considerably less money than the wide angle options.
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