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I only have the 5x powermate for imaging. If I had very good eyepieces (which i don't), I would look at a 2.5" powermate down the track.
If you have good, but not great eyepieces, then you will not get the value for money out of a powermate.
I would stick with your current arrangement. The current set you have gives you 25mm, 12.5mm (25mm & 2x barlow), 9mm and 4.5mm (9mm with the 2x barlow) this is a very good range of magnifications.
What sort of scope have you got: 8" tele 800mm f/4 ie refractor / reflector??
The next step, I would be working out what great eyepiece you are going to be looking at down the track and then seeing how a 2.5 powermate would work with it. This is a big step! Not knowing your scope, i would be unsure as to what to suggest.
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