I did notice that also. I just just was shocked by the enormous amount of brands/models available for the 225mm/285mm combo versus the 245mm/325mm combo.
I definitely like the 245mm/325mm combo better due to tire width, etc. They also fall within the recommended specs for appropriate sizing. However, after my current difficulty with my specific 17" tires being unattainable, my practical self says go with something that has a huge availability now so that in the future you don't have problems.
But then again who said owning a Pantera was ever practical? Thanks again - I appreciate all you help.