I've driven all 3, owned both the vee's and also Mk1 172.
The Mk2 v6 is the best car out of the three you mention but you'll always have someone beg to differ, ultimately its all down to peoples opinions.
Don't forget the cost implications of owning a vee though, and i'm not just talking about the initial purchase price either!!!
All my vee's have been second / weekend cars, just for fun, I've loved / love them all, and still wouldn't swap my present vee for anything else currently available for 27k new today on the UK market.
The best thing to do is try and get some decent test drives in. Then you can make your own mind up.
Cheers, Steve.