1. Tires run the gammot, depending on the type of tire you go with. The OEM tires are BFG A/Ts and I've seen prices run from $185.00-$225.00 per tire. You can check
http://www.tirerack.com/ for more pricing.
2. Oil Filter is the same as a Chevy Silverado, GMC Yukon, etc. I'm paying the same for filters as I did with my Yukon - $6.49 at Napa. You can even go cheaper if you go with a lesser grade product such as Napa Silver at $2.99.
3. Air Filter - $53.99
4. Fuel Filter - $12.79
Other common do-it-yourself type items such as brake pads, starter w/ solenoid, and battery, are comparable (price-wise) with newer Chevrolet 2500 HD trucks powered by the 6.0L Vortec engine.