I use Razorbladez. You can find bars a little cheaper, $75 for 8" 75 degree carbide on 1/2" host bar. But they perform well and best of all they have a 1 year warranty. I know what you're thinking, "yea right". But I but put mine on, rode 100 miles here (southern MN) on very poor conditions, then put 600 miles on in MI and hit every rock in the state because there was very thin snow.
So they were abused, they had 1 - 3" of carbide missing from each one but for what they'd been through they still held a pretty good point, if they weren't missing different amounts on each one I would have kept using them. I asked, and sure enough, "yep, we'll replace 'em" Now that's awsome!
I bought mine from richmotorsports.com, but I know our local dealer carries them now too. I use the Extreme Max Studs too, and they have a 2 year warranty.