Ideally, I'm looking for binoculars that are sharp across the view with good color and decent CA control. Good control of glare, too. Comfortable to handle, with a reliable build and warranty.
"sharp across the view" can be a bit of an issue. That would indicate using a bino with field flatteners and they are not cheap. So I think 300$ is a bit of a tricky price bracket. They won't be that much better than cheaper models and the real improvement in optics starts at around 500$/€ and above in my opinion.
I also read you want a wider FoV -- that means even more money to be spent if that wide view should be sharp to the edge.
I'd go with a bino without field flatteners -- sharp edges are overrated even though I do own 7 flat-field binos. But the wider angle models with moderate field curvature (blurry edges) work just as well and make up for the blurry edges with those wider views. Affordable flat-field models often have a rather narrow view.
One of my cheapest flat-field binos that I bought was the Canon 8x32WP (no longer made) -- 170€ used but at 8x magnification it only has a 7.5° FoV.
My recommendation:
Kowa BDII 8x32 with 8.8° FoV -- probably one of the widest views for the money. And it has much less distortion at the edges than the 6.5x32 version.
The Kowa is also of much better build quality than a Prostaff. I bought the new P7 and the diopter ring came loose after using it maybe 5 times. Everything is made of plastic on that model except for the lenses.
The Kowa has a magnesium body.
If you absolutely want the field flatteners -- many users on "cloudy nights" like the "Meade Masterclass" models. I never tried one, so I cannot say how good they are.
Also -- one small detail -- be aware that almost everything in that price range will be made in China. If you don't want that, I'd recommend something like the Fujinon HC 8x42 or 10x42 which is made in Japan. I have the 8x42 and think it is excellent. The only small nit-pick is that it suffers from "fuzzy field stop" syndrome, which means you cannot see the outer edge of the field stop clearly but that is something caused by individual face geometry and how deep-set one's eyes are.
Best would be to test in a store. I found my Fuji HC for slightly above 500€ but I don't see them for that price anymore. And it's 200 above your limit anyway.
So for the widest view in a decent quality package, I think the Kowa BDII still wins.