Ben, you got a fourth-version for $600? 😱 Is that the one that requires 46mm filters?
That's some price! 🙂
I got my third-version Elmarit for $658. It had a slight separation in the rear element, but John Van Stelten fixed it for $250. Mine takes a 49mm filter, and I find it fills my wide-angle needs. In case you don't find an Elmarit that fits your budget, take a look at the third-version lenses (made from 1979 onwards). Their prices are still very reasonable for a Leica wide angle lens.