this is probably my favorite lock right now. a little heavy, but if yr locking up downtown late at night or just running groceries/laundry its fine. for a race or whatver you proably dont really need a lock, just throw yr bike in someones car if it comes down to it. or bring a lighter duty lock. but no ones gonna want to **** with this one.
http://www.kryptonitelock.com/Pages/ProductInformation.aspx?PNumber=999508