For me the MP4-12C is still NUMBER ONE at moment. I say at the moment, because after seeing the Aventador, the one that will replace the Gallardo may be very nice in all ways: performance and design.
Now for me the most exciting cars are:
1. McLaren MP4-12C
2. Alfa Romeo 4C
3. Toyata FT86
4. Audi A3 Concept
No Aventador, not that I don't like, but for me it is just too much.