Kevin - My two-penneth:
 
 1). Can't advise on dealers - Not my part of the world!
 2). It'll be heavier than the scooby, but my wife has no problems with mine.
 3). Definitely consider a tip if the wife will be using it a lot around town - the ease of driving will offset the heavier controls.
 4). Early or late? - Not important - 'Buy on condition' is the oft-repeated mantra.
 5). Watch out for: 
 
 a). Recall work  should have been done (there was a recent recall due to issues with cab roofs if I remember correctly).
 
 b). Door check strap condition (if the doors click when you open them be prepared for a 600 pound bill from a Porsche bodyshop to do the repairs, although a precendent has been set whereby Porsche will pay 50% as a goodwill gesture given that it is in effect a manufacturing defect - albeit they will insist upon the stamps in the service book relating to the corrosion warranty).
 
 c). Tired suspension.
 
 Golden rule is to get a PPI done by a specialist.
 
 6). Are you mad? - Far from it! - eminently sensible I would say. Stay away from 996's! [

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 I Hope you find what you're looking for, and I hope others with greater knowledge than me chime in with advice for you.
 
 Chris