Stainless hardware primarily refers to screws.
There is a better strap.
I prefer the marine models and they are starting to show up in bigger stores, but to get the full line means going to specialty stores.
Some have good prices, but this can mean a trip or mail order.
For some models this can mean far too high a price penalty.
The 50 to 70 quart size might be found though.
I have paid as little as 40-50% of retail for the better igloo coolers, often with the tray and other accessories.
Try to get the tray included.
Coleman does differentiate most models, though some may take a direct inquiry.
Usually the higher priced model is the better one, but physical examination or inquiry at coleman may be the only way to see the difference.
http://www.coleman.com/coleman/ColemanC ... oryID=8550
http://www.coleman.com/coleman/ColemanC ... oryID=8581
Some interesting commercial models too.