This site has a pretty comprehensive list of wheel weights. Not everything is on there, but still a good reference.

https://www.wheelweights.net

If I end up getting a new cobalt XFE, I am thinking of going with a set of Enkei RPF1's in 15". 9.9 lbs each and good looking! :D
https://www.tirerack.com/images/wheel...f1_s_ci3_l.jpg
https://www.fuelly.com/attachments/fo...9552467f43.jpg