Why not V8 Vantage.
Anyways my vote goes to the Zonda
Well, I couldn't fit in every single car in the poll that has a distinctive sound. If I did, I'd have to include the Golf R32, the 335i and so on... I made my poll based on cars which made the biggest impression (well, to me at least).
Where's the SLR? It certainly has it's own sound...
D'oh! I completely forgot about the SLR. Sorry.
PS. No takers for the screaming Ferraris?