Ok gents, this one wins my attention by far, way far. Let's see; a little over 2lbs per hp or 480hp on 1,025 pounds, corners over 3g's! and revs 10k+, sorry supercars you don't even come close.
http://www.carpages.ca/go/roadtest/2007_caparo_t1_preview.aspx
http://www.carpages.ca/go/roadtest/2007_caparo_t1_preview.aspx