large open clusters are often the best small bino objects, and the large nebulae like eta, or magellanic clouds.
If you live in light polluted area, i think the 7mm exit pupil will be a bit much, they are more for dark skies where your eyes can fully dark adapt & take in the whole 7mm (measure your pupils in bathroom). I think 10x50 are the best for light polluted areas. (for tech explain see gary seronik website)
As for the diff between 7x50, 8x50 & 10x50 there is not a big difference - at this level it will be more about the quality of the glass, & coatings. I recommend you buy a good brand & they will keep for many years.
how uch did you want to spend approx?
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