Honestly, just by the fucking car. You don't seem to be listening to any opinions, or at the least, have rebuttals to all.
That being said, fuck the R8. I love the G55, and would jump at one if I had the cash. If you want AWD V10, buy a Gallardo...
ESS Tuning Software, JVT (Ebay) Headers, AFE Intake, RPI Scoop, ACS Pedals, and ZHP Shift Knob.