I have big hands too. I want a big mouse too but I find I like lightweight too. This mouse sounds like the closest there is to what I want though it's still not as big as I'd like. I want a light weight mouse that's either shaped like this but close to 6 inches long or one that's at least 5 inches long with a huge high hump at the back. Something I can actually rest my palm on without having my fingers sticking out an inch past the front of the mouse.
And yeah I hate how my pinky always drags on the mouse mat too! The only mouse that didn't happen with was an old Mad Katz Rat mouse I had 10 years ago that was very wide (supremely adjustable shape too) and had wings under both pinky and thumb. That mouse would've been really nice for me if the sensor wasn't so flaky.