I had a clunking noise with my 98 accord lx about 3 years ago. It's just like you described yours. My turned out to be from the work of a squirrel. Apparently some squirrel found a home inside a rubber boot that protects the front struts I think. Anyways, that damn squirrel stored a bunch of nuts inside the boot and when I went to drive it, it somehow bent my upper control arm and a bunch of other stuff. The strut was ruined as well. That was the wierdest thing I've ever had happen to me. It also cost me $666 from the dealership to get it fixed. I'm convinced it was an omen. Maybe your problem is from a squirrel storing his nuts in one of your boots too. Wouldn't that be wierd.