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Hellwig makes a nice bar, 1 1/4" in the rear, and it's adjustable. The front is 1 3/8".
Rear...$241
Front..$178
Sorry to bring this back from the dead. But Did you ever purchase this.
I hope I'm not threadjacking, but I recently went with the Hellwig 7702 front and 7701 rear. They're *really* beefy and the rear is nice because it's adjustable. I've put a good number of miles on them since the purchase and install and I'm pleased. The rear sway bar has three spots to mount the links and I'm on the middle mounts...the truck oversteers a little easier than I'd expect, but I expect that's a combination of aging tires and the sway bar not being on it's firmest setting. I'm going to adjust it to the firmest setting and see what difference it makes. Overall I'm really happy.
The biggest downside of the rear adjustable sway bar kit that I bought is that it comes with some nice end links that you can adjust the length on...the downside to this is that they're too long to use on a lowered Tahoe.