BTW: Anybody know what's the smallest wheel diameter that fits on our trucks (GMT 900s)? I'm also wondering if the Sierra Denali has any bigger brakes than a regular Sierra? I don't think so, but the brake rotors on my truck look pretty big.
I have a friend who has some 16's off like a '93 Avalanche, but I'm not sure they would fit my truck.
I think the best deal would be a set of Centerline Rotary-forged 17's with a little shorter tire than stock.
BTW: I calculated today that if I change the tire diameter from 31" to 28" it would be the equivalent of installing 3.73 gears, so there's something to be gained there too. Not sure how good it would look with the shorter tire height, though...

 

28" is going to look really small. Stay with 30-32". I doubt 16" will fit....there is really little room if you look inside the wheel.