Well since I forgot to update this thread back in April, and since there's another active tint thread going on, and really who can pass up a chance to post a pic of their car? - I'll update this few month old thread with some pics and details of my window tint.
I did end up heeding the advice of random people that I do not know on the internet, and did pay a professional to tint my G8's windows.
The grand total was $295 + NYS tax, and while 70% tint is all that is legal in NYS, I was greeted with a look of horror when I told the tint shop that I wanted to go with 70% or "maybe" 50% tint. I ended up with 35% tint (Suntek) all around (nothing on the front), and I'm very happy that I went that dark. It's been 3 months so far and the po-po doesn't give me a second look. I see lots of cars/trucks rolling around with windows as dark or even darker than mine, and no one seem to be getting bothered.
The tint itself looks great - as would be expected from a professional outfit. Perfect cuts, no bubbles, no seams, just perfect factory looking tint. I could never have done a job this good in a hundred years, and I will never even think about tinting my own windows again.
Post-tint money shot: