So the real reason behind the weight issue for you is taking what small # of cars an AV6 can?
Here's some more math for you to do. You say having these wheels w/tires is going to add around 200 lbs to your overall weight. Figure out your pounds per horsepower ratio stock, and then with the new rims...and I think you'll understand what Finch and Sketch are saying when they tell you the weight of these rims is not a big deal.
It's ultimately up to you, but this weight is not going to make a big difference.