I'm not worried about the 1300 so much, I was planning on getting a second part time job and using that money to swap out fiberglass piece by piece. I'm in no hurry. It could take 9 months to change over.
But what I have been looking for is actually lighter rims then my stock 13 inch steel rims...
http://wheelweights.net/
This site has a nice chart to quickly find lightest weight rims for your vehicle.
I read that every pound of weight you remove from the tire equals 2 pounds anywhere else in the car.
I would love to see at least 300,000 miles on this car. As far as I know replacing the timing belt, changing out the head gasket and regular maintenance is all I need to get there.