So much misinformation regarding the reliability of the zed.
Like any car, if it's looked after, it'll look after you.
If the zed has a service history and you give it a thorough inspection then you shouldn't have any dramas.
My best freind has a zed, lightly modded, hasn't missed a beat.
My now deceased uncle who had a 300zx good for around 600hp, which he died in , had no problems with it either.
Sure they are labour intensive but like any majormechanical repair, it's the difference between a $1200 r & r to a $1500 r & r.
Someone said earlier that the targa top is detrimental to torsional strength, 100% not true, it's reinforced up the wazoo but this does make the car heavier.
300zx's have a timeless super car look, once you ditch the orange in the tail lights and side indicators, slap on a wing west kit or some such they are a total head turner.
Skylines on the other hand, r33s are the new VL, your car doesn't appeal to me in anyway, not saying it's a bad car, modifying is a very personal thing.
I'm not a fan of the kit, the copious amounts of mesh and the stickers also the fundamentals you have over looked like ditching the orange indicators and wheels that don't accent the car.
At the end of the day you'll both struggle to get your asking price.
I'd say go for it.