I have very similar proportions to you, so I can offer some advice.
If you're looking for a slim look, then you want the D1 fit or the Alpha Khakis. With your quads, anything slimmer (D0, Khaki Waders) will be too tight. The D1s and the Alphas will feel slightly tight in the thighs when you first get them, but they'll expand the more you wash and wear them. The Alpha Khakis have a middle rise, slim thighs, and tapers in the lower leg -- it's a good fit and people have been raving about them in the Slim Khakis
thread. I like the D1 Soft Khakis even more - it's slim through the thighs, straight down the lower leg, and has a higher rise.
aphextwin07 is totally right about the inconsistent fits. They must have different factories producing their pants because I've had a 31x30 pair fit me exactly right and another 31x30 pair that actually fits like a 32x29. It's best to try it on and buy it in a store; even if you think you know your size, what you receive from dockers.com might fit totally whack.