I'm with you, Splatz. Alongside the GT-One (another mention - sorry!), the F1 GTR is one of my favourite sportscars of recent years. And to make you yearn even more, it wasn't just the look of them, they sounded incredible as well!
My favourites - definitely the Gulf Davidoff cars. If you play SCGT, you
must download these cars - they are probably the most accurate add-on cars for SCGT available.