My heads were milled-effect on compression ratio?

If you wanted a "thinner" head gasket- what options are out there for raising compression?
Copper gaskets?
Joe
Felpro 1008: .039"
Mr Gasket 1121G: .028"
Cometic: .027". 030" and on up in steps of .005" (About $100 per EACH head gasket BTW)