Dear ya,

From what I read, u seemed to have limited budget and financially a bit constrained..
If your ex5 is still good, why not just continue using it? The 3 bikes you suggested are very hot bikes. Like chips more.
Also it will be very annoying to always have to bring along so many safety equipments for the hot bikes (chain lock and two padlocks). Imagine everytime have to lock your bike when u stopped. Even more annoying when u have to unlock it. Bare in mind those locked locations are dirty and greasy, so your locks and hands will also be dirty.

Get a new ex5 if your old bike have problems. If want to upgrade, make sure you are not so financially constraint until need to pening about kapcai maintenance.

Some bikes are hotter and more desirable than others hence easier to get targeted and stolen.

And you are wrong about what bike also sapu. My dad once being targeted by mat rempit. They kicked him down when he was riding his bike, a modenas kriss. As soon as my dad falls, he quickly got up and ran into a housing lorong screaming for help. So the rempits didn't chase him and just took his bike. Yes, the bike was taken and being rode off. My dad then returned to the place he fall off to get his house keys, that's when suddenly the mat rempit returned, dump his bike near him before speeding off in one bike.

In short, my dad's modenas kriss is like a landwhale. People give free also don't want. -.-

Hopefully it is because they feel guilty because my poor dad is bleeding from the fall.
But I think it is more to they feel it is not worth it being targeted by the police for a modenas kriss.