Well I can tell you're outgoing, great to see.
We look forward to you getting your Skyline. Some of the cars on this forum are much better cared for then some others out there, and we can call peoples bluffs here to some extent, so you can buy with some confidence.
You can get your skyline to a racing standard without it being illegal on the road. I've tracked mine and attended Cams events while still being a road car so don't be affraid to track it up.
As for the car, everyone recomends a Manual and Turbo, and if you have the money a GTR.
R32 is the classic, light weight anglur form.
R33 the car with curves, has probably the most long lasting looks, but pick on what you like
R34 The updated classic look
Depending in your budget R34 GTT will have few problems, or if you like track cars, a well looked after R32/33 GTR.