Try Team Dynamics USA:
Rimstock Plc Light Alloy Wheels. The Worlds most desirable wheels.
Don't forget centerbore size. if I recall correctly the GTV6 is 58.6 mm. So, be sure to get
hubcentric rings if you decide to go 5x100 with the floating wheel nuts. Some guys that are riding on their 22+ year old wheel studs are doing this (because they
absolutely have to have big aftermarket rims), are getting away with it, but IMO you'd be taking your life, and more importantly, the life of any passenger/s in your hands.