If you are a newbie to bikes and cannot rectify your problems by your own then GS150 is not for you my friend. Because GS150 has so many quality issues. I have GS150SE and its power and performance at height were the only reasons which compelled me to buy it as I visit Northern areas frequently.
One must go for YB125Z because its paint and electrical wiring quality is far better than GS150. YB125Z has slightly less power than GS150