you can get chrome American Racing RT/S's 20x8.5 but the black version won't fit our trucks...bastards.
You can also get up to a 18x10 Mickey Thompson Classic II or a 17x9 Classic Lock
I'm not too sure about most other wheels, but if you ever go trailriding or offroading, DONT go with an import wheel, since some of them will fit. You probably shouldn't go with any import wheels except forged ones cause they probably can't handle the wieght.
There are some awesome Centerline wheels you can get, too.