If you are looking for good dawn/dusk performance a 10x42mm may be a problem. I would look at a 10x50mm if you need a 10x and you want good low light performance.
The Nikon Action Extremes are much better than the Nikon Actions.
In Wichita, try the Sportsman's Warehouse on Kellogg Dr. I would also suggest looking at Pentax DCF WP IIs, Celestron Noble, Eagle Optics Ranger SRT, Audubon Equinox HP, Leupold Olympic 10x50, Swift Ultra and Vortex Fury.
If you get to Kansas City you can look at Audubon, Eagle Optics and Vortex binoculars at the Wild Birds Unlimited there. There are good models from all three in your price range. There is also a Cabelas in Kansas City, so you could compare many models there as well.
I would look through a variety of glass and let your own eyes discern which is best. If possible, after properly focusing, stack two pair and look quickly between the two at distant, hard to resolve objects under different light conditions. The better of the two will quickly become apparent.
Online, Eagle Optics and CameralandNY will let you try optics for 30 days and will refund the full purchase price if you don't want them and return them in as new condition with all original packaging.
The absolute best binoculars under $400 are likely the Swift Audubon 820 8.5x44mm porro prisms. They have a view as good as the Swarovski ELs for $1000+ less. The only knock I have on them is if you are an eyeglasses wearer they may not have enough eye relief for you.