I have a Harley Fat Boy (hence my forum name) and a 1951 Vincent.
TButtrick,
I think you may be in for a surprise if you think a Vincent is going to be significantly cheaper than a Cobra.
Originals are now commanding big prices, due in no small part to a plentiful supply of high quality spare parts through the owners club and other sources.
I'm not overly keen on the U.S. Vincent recreation. Apart from the engine, everything else is very conventional, but if you want something new that is more in keeping with the originals, have a look at
Patrick Godet's creations.
Paul