I've been through a number of them over the years. The Gander Mtn posted above looks pretty cool. I now have the Yeti and it is awesome. I also like the Seattle Sports Frost Pack. I have the 12Qt. It does not leak and has survived despite my repeated attempts to destroy it.
Claimer: Someone that makes a claim that they have been there and done that, can do anything you can do better than you. I hate "claimers"
I've heard good things about Polar bears and AO coolers i believe. I was kinda impressed with the Yeti when I finally saw one in real life. I too was surprised with the lack of insulation on the top but heat rises and cold sinks, so maybe?
However I think I've decided to build my own before the next time I need to buy new PVC glue...using 2 older drybags and some thick foiled insulation material I've squirreld away. Just for fun...
I just bought the Polar Bear cooler from DRE and I am super impressed. It fits perfect in the captains bay on the side of my feet and it has tons of straps to strap it into the frame. I used it for 10 days in a row on a recent trip and it was one of the best additions to my boat. Its super nice because I don't have to open my big cooler throughout the day for beers. It held ice surprisingly well and is well insulated. I have about 4 other soft coolers that are now collecting dust or in the trash do to straps ripping off or the lack of insulation.