Unfortunately, you just have to try them on, it's so body specific. I have skinny legs and a small ass, and many jeans just slide off of their own accord. For me, Levis skinny and skinny-sh jeans fit really well and are reasonably priced, but they are pretty cheaply made and don't last. Seven for all Mankinds are ok but always a bit baggy. My most recent good find was a brand called Scotch & Soda, which fit awesomely - but were sized completely incorrectly. Jeans are always sized smaller than you really are at the waist - and I usually wear a 32 or, when I'm in especially good shape, a 31. In these, I wear a 30. Weird - and it just goes to show, get thee out to a place with lots of good denims and just try them on.
The important thing is to avoid (1) anything with pocket flaps, and (2) as 7Farmark said, anything else with so much stitching on the ass that it makes you look like a complete douche.