The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
I could spend the rest of my life fishing those streams down there for wild trout and could care less if I never caught one over a foot or even 10 inches for that matter.
For the type and sizes of streams you are talking about fishing with your new rod, neither wind nor trout over 17" are going to be an issue for you.
I've fished the (mostly North Carolina and GSMNP) southern Appalachians quite a bit and of the two rods you seem to be considering, I'd suggest you go with the 7 1/2' Cabela's rod. I think it would be a more versatile choice. There are a lot of tight casting situations where a shorter rod might serve you well, but there are also a lot of places that are more open and where you're probably going to wish you had the extra six inches of rod both to help you cast a little farther and also to help you control your line on the drift. This is especially true on the GSMNP streams, but also applies to the entire Blue Ridge small to medium stream fishery
I'm also going to suggest you at least consider a four weight (or even a five...) for this rod you plan on buying if you can find either in a 7 1/2 footer. As you gain experience fishing small streams, you're going to find that it is a very useful thing to be able to "punch" a cast under a hanging hemlock bough or rhododendron branch into a relatively small target area. While today's lighter rods with their faster actions are better at this than they used to be, a three weight rod is still an inferior tool to a four or five weight for these kinds of casts.
Good Luck! I envy you. I could spend the rest of my life fishing those streams down there for wild trout and could care less if I never caught one over a foot or even 10 inches for that matter. Just to be there would be enough..