dear brother
appreciate ur intrest in this thread and detailing ur ride.
here basicly 2 type of car wax
a) natural wax which also called carnuba wax
its gives warm feeling and glow to paint, its also give depthness to paint colour and give visible results on dark paints
however its life relatively less and attract more dust than other type
b) other type is synthetic wax, also called man made wax, its give long lasting protection , deliver silky touch to car skin so attract less dust and most important gives high reflections
since ur car skin is silver falls in lighter colour range so u have less margins to darken the colour , so synthetic wax suits most to your car, plus u are in karachi having high humid climate so top coat of synthetic wax good for ur ride.
my vote is for synthetic wax, like turtle ice polish, meguire nxt, mother fx sync wax
however detailing geeks use combintaions of both type waxes 
