I have to second everyone on the COH's, Joe's, and True Religion... these three are always in my weekly rotation.
My newest additions in the evergrowing denim section are 2 pairs of James (which have been around over a year now). I really like wearing them for work since they seem to have more coverage when you sit, but still a good low rise...James Jeans Original Bootcut in Grey Swan and Midnight
My absolute fav is Joe's Jeans Honey, but I have found cheaper alternatives in Express's W31, I bought a pair last week and they fit really well for my ample booty and the make my legs look slim, also they are comfortable. Also I like See Thru Soul's I am Frankie Bootcut fit (sold at Nordtrom and Rampage).
for a good basic jean i like james. the fit is flattering and they're not heavy on the logos so you could wear them everyday and no one would really notice that you're wearing the same jeans. also the price point is decent.
for something trendier i like antik (i've finally gotten over my initial sticker shock) and true religion. the cut on both brands is very slimming, but the low pockets can make even the most ample booty look flat.
if you're looking for something in an interesting wash i like diesel. imo they have the best washes.
for trouser jeans i like seven. they make some great trouser styles that i like a lot more than they're basic five pockets. i'm eyeing this style for fall