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Welcome Emma. I can tell you that you can see plenty with a 150/750 scope. I've had mine for 30 years!
Your 25mm and 10mm eyepieces are just fine and if you get a Barlow you've got the equivalent of a 12.5mm and 5mm as well. So with 5, 10 and 12.5 the 8mm may not add much.
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