Your opinions please

[mycerbera]

I sold my 4.2 C8ERA last November after 9mths ownership. (and £9k running costs) Now looking for a Griffith 500 for about £15-16k hoping for a N-reg with about 40k on it. (Sound about right?) Did the odd TVRCC track day in the Cerb and it was amazing round the bends and on the straights of course. How will a 500 Griff compare? Anyone had both cars? And what about day to day driving, how does the experiance differ between them. Thanks for ur views in advance.
Also anyone know what the deal is with the 500 havin 340BHP then 320BHP? What Reg letter plates are they both on or yrs manufactured?
(Just got Steves Griff/Chimp bible so will start reading through that soon)