The most weed resistant grass that I've seen at MSU field test is "poa supina". This grass choked everything out, excelled in poor soil, and is very durable. It's not cheap, but even with a blend with only 5-10%, it will become the dominant grass in a few years. In my personal experience, the tall fescues seem to be the pretty good at competing with weeds.
"the Constitution is a charter of negative liberties" Barack Hussein Obama
If you like the job Granholm is doing for Michigan, you'll love the job Obama will do for the U.S.
“The best argument against democracy is a five minute conversation with the average voter.” Winston Churchill