Additionally, when looking to beef up the wheels/tire package on your D, you may want to check out this nifty calculator I found for comparing the differences in sizes. This is a wonderful reference:
On top of that, I started another thread listing a great set of folks I've been working with for years when purchasing wheel/tire combos. They've always treated me right and I've never been able to locate a better deal. Here's their link:
Good luck and make sure to let us know what ya get...I want pics, haha!