Have you considered 6x30's? They are very stable, very bright, very comfortable to use. Given that you already own some quality 10x42's this might be a better option.
There aren't a lot of choices, but the available choices are excellent. Leupold offers the 6x30 Yosemite which is a sub $100 porro prism that is very good for the money. Moving up in quality is the discontinued Vortex Viper HD's 6x32. These are really excellent bino's and you may be able to find a good deal on some close out stock somewhere. Maven optics is offering a 6x30 now. I haven't had a chance to look through a pair yet, but I would be surprised if they weren't excellent. Maven has a demo program that allows you to return the binos if you don't like them.
http://mavenbuilt.myshopify.com/collections/demo-units/products/demo-unit-b-3David
