Do not get the 5.3.... They are crap. Mine burns a quart of oil every 1500 miles. GM says it falls within their QA specs and is not an issue. ********!
I've got an 07 suburban with the 5.3 I got it at 25k miles and it currently has 102k. The engine is significantly underpowered for such a large vehicle. I would go back and get the 2500 with the 6.0 if I could do it all over.
I know of several others who have the 5.3 and all say the same thing about burning oil and being underpowered.
Thats odd I've owned 4 of the 5.3 engines, one in a truck, two in tahoes, and one in a suburban. None of them burned a lick of oil or seemed under powered. Maybe the newer ones are neutered mine were all between 99-2002. Actually the tahoes seemed to be a bit peppier than the suburban and the truck.
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