I also live in the middle of nowhere, so wellies are pretty standard footwear for me! I've owned wellies from several brands, and my last two pairs have been Hunters. Personally, I find them to be the most comfortable brand, although, especially given the price, not always the longest lasting. My mum insists that this is because production must have been moved to China, as her last pair lasted for about ten years, whereas her newer ones leaked after six months, but I'm not sure if that's entirely true! If you're looking for warmth, wellies aren't really ideal, and you'll need thick socks. That said, if you're willing to pay a little more, neoprene-lined (like wetsuit material) wellies are a bit more insulated, and very comfortable. Hunter do them, but I'm not sure how much more they are than a standard pair.
You may find that if you're only wearing them to go to college in bad weather, any brand will last, because you won't be bashing them up too much. Just go in to a shop, try some on, decide which you find the most comfortable, check the price isn't astronomical, and buy those.