I guess Levi's Jeans is one of the popular brand for jeans. I've got a pair and I think I love the fact that it is very durable. I've been using my jeans for the past 3 years and although the colour has run off a bit, it is still as good as new.
The colour fades with 'style', that is to say, even after it has run off, it still looks food. And the quality of the fabric stays the same. If you're into something with style, get one that has "cut" like boot cut. It doesn't make it boring.
The one problem I had while choosing my jeans was to choose the right size. Well, I am thin, so I had a problem choosing one that fits my butt and waist. If it fits my butt, it doesn't fit my waist and vice versa. But nonetheless, it was a good buy in the end - you just had to be patient.
Also, Levi's has a huge range of style, both for ladies and men!