This question was important to me too a bit time ago and here are some alternatives:
1.Mazda Furai Concept '08 [PP:660] [PP (Tuned to max): 692]
2.TVR Cerbera Speed 12 '00 [PP:640] [PP (Tuned to max): 690]
3.Citroen GT by Citroen Concept '08 [PP:681] [PP (Tuned to max: 687]
4.McLaren F1 '94 [PP:611] [PP (Tuned to max:676]
From my experience, TVR Cerbera Speed 12 '00, is the best if you want to achieve a big top speed.
Mazda Furai Concept '08 is very light (to weight), and fast too.
Citroen GT - I was amazed, that Citroen GT (by Citroen Concept) is on electric power + try to go with it reverse and you won't be stuck on 80km/h limit, but it can go as fast as on forward..
McLaren F1 is great, because of it's handling and speed. Interesting is, that this supercar was made in 1994...