Distortion at the edge of the field of view is not normal and is the sign of poor quality
sorry but you need to go and look some more. As I have never been to Cabelas the models you ask about mean Zilch to me.
Binos need to the tough waterproof and clear in optics
Magnification is a personal thing but trying to hold more than 10X still so you can focus on detail like antler quality
well most folks find it impossible without Image stabilisation. So 8x is a very good choice for all round use. For higher mag and to see further I use a telescope which goes up to 60 times. Lens quality matters
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Warrenty
well never having the need to use one my personal opinion is to choose a good well known and RESPECTED name and buy the ones you like and that you can see well with. Though I really wanted some Swaroski SLC binos I simply could not afford them so brought a pair from the Bird watching reserve's shop where I could try them out first. Not such a well know name but the Birders seem to use them a lot and so far after 6 years or so of use I have no complaints
they are 8x44 Roof Prisims.
Birders are quite strict in their quality selection so it's often a good place to look and ask about binos!