I want to buy a car 我想买台车（当然是自己的）
I wish to own a car 我希望拥有一台车（类似许愿或他人问想要的礼物时）
I want to have my own car 我想有自己的车（现在可能用的是别人的车）
看是什么样的需要，语境不同时所用的单词也不一样
i want to own a bike
a bike is my the thing what i eager for.
What I want most is a bike.
好了，采纳吧
I want to have my own car
I want to get a bike of my own.
I want to have my own bike.
I want to have a bike myself.
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