Hi Mike,
From my own experience, they rust in pretty much the same places as Z's. Dog leg, bottom of doors, bottom of front fender, behind rear wheels, spare wheel well, battery tray... Also check the sill just above the tail light panel when you open the boot. Floors too if you can see them!
The hardest parts to find IMO are the stainless steel trim bits. It seems every owner has dinged every corner at least once... if you're not a perfectionist I guess this wouldn't matter to you though. Make sure it has good glass too, it's $320 in Australia for a new windscreen, but you can't get any other glass (haven't tried Nissan though).
All I have bought for mine is brake pads, so I dont think I could answer your last question well. That said, I can't imagine any parts being more expensive than a Z.
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