I've seen incredibly mixed reviews of Rimowa's Topas aluminum line. It seems to me that polycarbonate would scratch/crack more easily, but I have not travelled with a Rimowa yet. I will be buying a carry-on and hopefully avoid rabid baggage handlers, but would of course like the suitcase to be as sturdy as possible. Also, any other suggestions/comparisons would be much appreciated. $1000 or less. Thanks!