Easy mods

I was thinking of doing aftermarket supercharger but will probably opt against it after shelling close to $80K (with tags, taxes, fees) for my C7 and will rather wait for Z07 in a year or two. So my question to everyone is this: what are some fairly easy mods that can be done, say under $1,000 to increase performance? And any specific info to manufacturers, shops, websites would be appreciated.