If you want the best, get Canon's image-stabilized 15x50 binoculars. Image stabilization is a miracle technology.

Unfortunately, the pairs that I have are all no longer produced. If I was in the market today, I'd probably look on Craigslist for some high-quality second hand binoculars. That way, you can go and test them in person after you've researched them online, and you should be able to get more for your money compared with buying a new pair.

For astronomy, you want a large objective lens:magnification ratio, because the higher the magnification, the dimmer the view. For daytime use, this doesn't matter, but for looking at faint objects at night, light-gathering power is everything. Get this ratio at least up around 5, or ideally 7, so 7x50mm binoculars would therefore be better (and lighter) than 10x50mm. I'd start with those before possibly getting some larger (e.g. 15-16x70mm) ones, or just moving straight to a telescope.