I use the Pitbull Growlers & love them, but I know they are pricey. The Rip Saw's are a great tire, but clog up in mud.
I don't mean to hijack this thread, but you may also want to look at the GBC Grim Reaper tires. I think they are about the same price as the Rip Saw's and are pretty comparable qualitywise.
2009 Polaris Sportsman 800 Touring - K&N Airfilter - 2500# Polaris Winch - Front Brushguard - Rear Bumper - Polaris Handguards - 3 Headlight Mod - Pitbull Growler Tires