Lifegear Bike

I want a bike for fitness that I increase my stamina and develop my heart and lung capacity. I want to be able to run 3 km without losing my breath. I don t have time to go to a gym and I want to buy a fitness bike.
What do you suggest a standard stationary bike, elliptical or another (that is, without a seat and you move the handles while you pedal). Which is better?
Could you point me some good brands? I found in my country the following brands: Orbitrek, HMS, OLPRAN, LifeGear, Sporter, Ab Fit BY-320/AK 116 Abisal.And Kettel, but they are so expensive. I want one for a maximum of $ 300.

Honestly, I would really think about a gym in this case. You say you do not have enough time? Maybe if you woke up a little earlier or went after the evening work, you have extra time?

This way, you could try whichever you like, and most of the time, it is preferable to put in place, and something new. How far is the nearest gym? I looked into it for sure!