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Qc can be a gamble with the skymasters I'd be more inclined to go for the 20x80 Andrews offer(in either triplet or doublet) keep in mind you'll be doing the qc show check them over whence you get them.
The 15x70 ultras at andews would be my pick though ( or the 10.5x7@ for that matter) 20x80 just never hit a sweet spot for me & the 70 ultras have sweet coatings, & are built like tanks
I presume you have a good tripod already, you will need a fluid or geared head rated for 5kg to mount them also
If you can pickup a secondhand vixen 20x80 they are well made & hold collimation better than most of the current Chinese crop of 20x80's? Sme of the Orion models eg mega or giant view are good also, check if star optics has any left at clearance prices
Do you wear eyeglasses when observing, if so is it for astigma, you'll need long er in that case
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