I own three Pelican 1510s and I purchased them at different times from B&H. They seem to have the best prices, or at least really good sales on Pelican products from time to time.
Yes, Pelican cases are heavy, but for my use they are invaluable. I travel via car, commercial planes, private planes, trains, and have had my Pelican cases strapped to the top of expedition vehicles, horses, and yaks. I've traveled through rain, mud, and some of the dustiest places you can imagine and my Pelican cases have endured everything they've been through...with ease. I also find the 1510 to be the perfect size, because although heavy when fully-loaded, the size of the 1510 limits the amount of gear you can put in...therefore limiting the weight to a manageable amount. And by owning three 1510s in three different colors, I can choose how many cases to carry based on that particular trip's needs. And I can travel worry-free knowing that no matter what, my gear is protected, dry, safe, and secure (when I use locks).
It really is a versatile system, for me.