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Problem with StageA's apart from the name is they are still a big heavy Japanese car. Interiors are full of hard plastics. And they are not refined in the same way a E39 estate would be. I think you'd have to fit some fairly nice suspension under the stagea to get that kind of ride quality and handling. Also, the engines are pretty gruff and think the 850 r already ticks the tuned turbo box.
That said they have unicorn badges and with the r34 front do have a certain cool.
Sounds exactly like a stagea, they're much more relaxed than an actual skyline or GTR and most for sale seem to be autos. Not sure how fast they are IRL, you planning mods or leave something stock?