CGT is hard to beat.
Some options:
Murcielago LP640 - manual
Diablo SV / SE30
512M - looks cool, has some weak driveline issues
XJ220 - assuming you are passing on this since XJR15, but honorable mention
EB110
Saleen S7 twin turbo - kit car'y build quality, but has a hell of a presence
Not...