When I purchased my 09 it had 25 aspect Nitto's and was slammed with KW Variant 2. It rubbed a bit at that height, so I raised it up to make it more driveable.
After installing the PSS tires I raised it a bit more to clear the rear 30 aspect tires.
If you have an adjustable suspension you can set the car to any ride height you wish.
The lowest ride heights look the best, but you get rubbing, poor track handling, and poor drivability over bumps and going up driveways.
As most things, once you get away from stock, you are going the need to make comprimises.
The 30 aspect tires really fill up the rear wheel wells, and have a pretty beefy look. Got lots of complements from other Viper owners. I really like the look, and the enhanced performance, better ride and lack of tramlining are all major positives for my normal street driving and going to Viper events with the Southern California Club.
Will try to post some pictures.