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Budget: GSO 2x 1.25" (not recommended with such a good eyepiece)
Intermediate: Orion Shorty Plus 2x 1.25" (approx $130)
Top of the range: Televue 2x barlow 1.25"
Top of the range: Televue 2.5x powermate 1.25" ($310)
I'd probably get the orion shorty plus (same as the celestron ultima barlow). The televue barlow isn't going to be that much better for the price difference.
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