QUICK, buy this one and make $150 profit!
http://cgi.ebay.com/ebaymotors/ZX-6R-ZX-6RR-636-Ninja-Rear-Wheel-Good-Shape-zx6r-zx6rr_W0QQcmdZViewItemQQcategoryZ35601QQihZ002QQitemZ4653403032QQrdZ1QQsspagenameZWD1V
If it was my bike I would probably opt for a new (used) one as well. You can bend a pop can back into shape, but it will never be as strong. On the lip like that, being alloy, the repair costs will be too much to still have a "repaired" wheel.
Get another wheel, sell yours as-is for $50, and put some more air in your tire.