Yokohama YK520's ($125/tire @ Discount Tire) appear to be (at least) a step or two above the Goodyear Integrity's and are priced about $25/tire under the Goodyear Fortera and/or the Michelin LX4's ($158 & $152/tire respectively). The ONLY thing I know about these tires is that they have fairly long warranties. Then again, the Integrity's had a 50K warranty and are worn out here @ 21K miles so who really knows. It is frustrating that nobody (appears) to measure rolling resistance for tires. At least it appears that one state is taking a stance to get this information into the consumers hands...
http://www.energy.ca.gov/reports/200...-001F-VOL1.PDF

Here's the best article. Page 60 or so appears the most relevant to today (but the data is still from 2002)