I think most have looked at the cars on your list.
350Z for me as it looks stunning, is a good drive, doesn't cost the earth to run and it's reliable.
Honestly though, drive them all. You'll know straight away which ones for you.
Offset is often stamped on the rim as ET then the number. eg ET20
The tyre profiles would be better to match in my opinion. A 30 all round would work fine.
I have had a Porter Cable 7424 Random Orbit for a couple of years and recently bought a Makita 9227 Rotary Polisher.
It isn't easy work. I think it's harder than doing it by hand as concentration has to be 100% (especially with the Makita!!!) but the results are very good. Don't be scared to do it but also invest in GOOD stuff! Machine polishers work with products specifically made for machines.
It is expensive to get all the right gear but it will last for ages!
Have a gander at the ice projects. There is a good range on here.
H5 has an award winning install that is VERY stealthy.
I have heard from all the ice gurus on here to ditch the rear speakers completely as there is no need for them.
One member had a W7 put behind each seat! I can't remember the user name though....
The ICE gurus will give you their expert opinions though.
Mine was delivered today. Straight out to get it fitted to the Zed driver side. The new version does look to be better.
A 30 second job and they supply all the bits.
And for a demo.......
And yes, it actually does make a difference!