why u are going for turbo..just modify your engine with
improved air/fuel intake,exhaust system,bosch super or dual ignition plugs,big mouth muffler for easy exhaust release,high tension wire and coil...
all these can give you more horses..
and after that if u waana add turbocharger so i will prefer gli bcz exi can't has vtec it cannot give you same result as given by VTI.....
so i will prefer 1.6 GLi