I tried Brooks Brothers slim fit khakis. Way too full just like the JAB khakis.
I picked up a pair of BR Emerson vintage straight chinos. I like the fact that they are slimmer through the thigh compared to the Gavin's. The chinos are a little more casual, but will still work in a business casual atmosphere. I also picked up a pair of BR Tailored slim non-iron cotton pants. They are really nice.
http://bananarepublic.gap.com/browse/product.do?pid=905686002&desktopSiteActive=true
I can definitely see the better quality of BR over Gap in terms of fit and finish, but I still plan on keeping and wearing the Gap khakis. I'll make a more accurate and fair accessment once I have worn them all for a while.