Second the Stellarvues.
I've got the 9 X 50 and 10 X 60 versions. The first makes an excellent small spotter as well and is sold with a tripod mount, by SV as the 'Sparrowhawk'. The 60mm is just as clear but has some noticable field curvature.
I've also seen a TAK FC60 and WO Z66 used as finderscopes, though they are a good deal heavier than 'normal' 'scopes they were both brilliant dual-purpose instruments.
Also highly recommend is the Orion 20mm WA illuminated reticle EP which will fit almost any FS with a removable EP.
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