Last night, after seeing the suggestion here, I picked up a couple of Lived-in Slim Chinos on sale at Gap. They are very soft, nice medium weight, and they did a great job on achieving a believable broken-in feel. The fit seems good but I am not the best gauge... at 5'5", I typically have to get all pants tailored so that they fit proportionally. To me, they seem a bit too casual to try to dress up more than just a little bit but they would probably work for casual Fridays at my office when I don't feel like wearing jeans. All in all, I think I am going to love them.
I've had some H&M slim chinos for about a year. I don't know how they compare to the current seasons offerings but they fit pretty slim (kind of like 511 Levis). The quality seems decent - they haven't fallen apart or anything - it's just that the fabric doesn't appear to be anything special and they are pretty lightweight. Again, I don't think I could dress these up either. These have been my go-to lightweight basic chino that I wear with boat shoes in warmer weather.
Based on suggestions from this thread, I'm planning on trying some Unis Gio and Brooks Brothers soon. Then, I'll have a nice spectrum for comparison. I assume that either of those might have the potential to be dressed up a bit more.