Help Needed, How much shimmy is normal?

[Bradnsandy]

How much shimmy in the steering wheel is normal in a stock 2010 2SS/RS Camaro? How much vibration should I be feeling? The vibrations/shimmy are different at different speeds.
My story so far: bought my dream car 3 weeks ago, when I went to get it there was a ding in the rear bumper which the dealer fixed and I picked up car 2 days later. On the way home I noticed a shimmy in the steering wheel and in my subjective opinion considerable vibrations, especially when the speed exceeded 75. Called dealer who told me it was probably flat spots on tires from sitting and it would go away in a day or so. Didn’t. Took it in, they checked balance and service guy said it was riding fine. After I insisted they look at it closer, they found what they told me a bad tire. Came back week later and changed tire out. Drove away and though it was better it still wasn’t right. Went back and test drove a different Camaro. Completely different ride. Went back to dealer, who’s idea was to swap all wheels and tires. Drove my car away and it subjectively felt better. Now a couple of days later the shimmy is back. This will be the 3rd time I have to go back to the dealer in 3 weeks on a brand new car.
The service manager tries to tell me that I am on “high performance” tires and when they are cold they are supposed to cause vibrations (even though it is an hour drive to the dealer, how warm do the tires need to be). Then they tell me other crap, which makes no sense.
I really like the car. I just don’t want to tear up tires and wear out suspension parts, and cause the computer to crash (which the service manager says is impossible). I want to believe them, but I don’t want a lemon either…

[Sevn86]

I have had so many minor problems with my car but at almost 3000 miles everything is calming down...my shift stick vibrated from day one and now its barely there so i think it takes time to break in...