i would definitely have a good look at private cars from some of the longer term SAU members.
most of us spend $$'s lovingly modifying things and we NEVER get our money back but knowing it has gone to another enthusiast decreases the pain of selling.
keep in mind, standard turbos have a lifespan, timing belts every 100,000km (and you often don't know precisely how honest the odometer is on your car ex-japan).
so allow a little cash to cover a few expenses in the first 12 months and you are sweet.
our S2 stagea needed a new clutch and new coil packs from the get go (once we started modifying) but my R33 GTS-t ran on the standard clutch and coils for over 7 yrs.
i would be reticent to use a dealer with their required commercial mark up plus the warranties offered are pretty weak.