Another addition to the Original Post.

I've put up my "Wheel Stuff" XLS file that I use to calculate the changes with different rims. This came about after the numerous questions on this site, others and some personal friends.

At the very top of the sheet is a LARGE chart of profiles and tire heights as well as sidewall heights chart.

The meat of the sheet is the wheel calculator, it lets you put in an OEM configuration and will give you overall wheel/tire height as well as tire width in inches as well as the millimeters you plug in.

When you add a non-OEM configuration below the OEM, it will give you the differences and allow you to plug in spacer sizes that adjust the final numbers as well. It also gives you the differences of the rim size larger or smaller than the OEM. This includes the tire widths as well.

Hope that it is a useful tool for people here.

Cheers!