I agree with Oz GTR97V to a fair extent although on a somewhat different basis. Whenever I have looked at a car and it comes to the driving stage, I get them to drive first - partly so I can concentrate on other things that I may miss when I am driving it, conscious that I am that it is someones else's car still (!) but moreso to see how they drive it. I remember a classic with a Soarer twin turbo (considered quite a few other cars while looking for the 'right' SVX) and, from cold, he guns the *&^*&^ out of it non-stop....any surprise I decided immediately that I would not want it!
Overall, with 'performance cars', its a catch-22. You need to drive ti to decide it you want it, but you don't want to waste someones time then by the same token from the seller's point of view, he/she wants to sell it! And that, pardon the frecnh, crap about "well Motor/Wheels etc etc" say its good so you don't need a drive (common with Subaru dealers in the late 90's selling WRX's) is complete claptrap!! You need to drive a number of them, and for a long period of time too - 5 mins around the block tells sweet f/a - hence the need also to look at others for comparison. I'm sure that the GTR is an animal of a car, I am sure that it goes like the proverbial but having not been in one and for an extended period of time, I don't know whether I would buy one. By way of example, a F348 goes like the devil, looks great but having been in a few for, collectively, a few hours, I would not buy one. But when I was first in them I thought "wow...I would get this!"
I guess at the end of the day it comes down to gut instinct - do you believe they are serious. I was always upfront with the alternates that I looked at "I have been looking for an SVX, have been unable to find one worth buying and yours is an alternative" etc etc.
With the deposit thing, its just a personal thing but no matter how serious I was, I would not be putting a deposit down - if I did, it would be with a contract quite a few pages in length that the seller would have to sign too- there is just too much that can go wrong with handing over sums of money on 'word' alone.
C'mon guys...surely someone here can buy it rather than enrich some dodgy Parra Road cowboy!!
Jamsvx