What lift for 2008 Chevy 4x4 2500HD LONGBED? New to 4x4 diesels

[Hazieview]

Found a smoking deal on a 2008 Chevy crew cab 2500hd 4x4 6.6 Duramax 6 speed auto Allison transmission.

I won't buy it without getting a lift kit. I was thinking a 6" lift kit. I won't be getting into too rough of terrain. Mainly hilly red mud, rocks, mesquite and highway driving.

Would this be a good lift? What size tire would you suggest? Also will I get s major drop in fuel economy with a 6" lift and bigger tires? New to 4x4 diesels. Any help would be greatly appreciated.

Thanks!
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[Chevy1TonFun]

I would go with Fabtec, Cognito, or Full Throttle.