^240sx will be the "cheapest" to maintain and modify out of those choices but also will probably be the most expensive because there will always be something you'll need/want to replace on it. I'm a little older than you and I picked up my first 240 (95 S14) back in December.
I chose to pick one up that was automatic because they typically are in better shape for obvious reasons. Still the engine leaks oil and I had to replace an axel, tension rods, and a full tune up. Also I 5 speed swapped it. It's my daily and only car. It smokes and isn't fast but it's reliable and I'm working toward rebuilding the engine and replacing all the seals. Then I'll be set.
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95 SE in progress... Daily, Ka, Rezax, Navan, future cool car
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