Barry,
it's quite easy to convince her for classic...
... what about a 8/15 days trip in western France ?
You rent a cottage, you have some out-of-car activities, museums, cultural places, castles,...
... and the Classic will just be one of the attractions.
Classic is quite incredible and a large effort will be done this year to make it more "classic spirit", turning this event to be a continental Goodwood.
2002 prices were 45/50 euros for entrance and 10 euros for paddock pass (a must-have extra ticket).
You'll have around 4000/5000 classic cars parked all along the track.
If you've a few money, I even can arrange you an accomodation in a castle, at least for the week-end. Does your wife never dreamed to feel like a princess ??