Road wheels are always going to be kinda heavy, being made to drive up gutters and through potholes while carrying the family etc.. when i said minilites before i was looking at the superlites weights. different wheels entirely. if we are talking race wheels then:
minilites in proper forged magnesium 15x7 are 4.76kgs and in 14x6 are 4.54kgs.
compomotive in cast alloy are around the 8.5-9.5kgs for 15x7 depending on specific style and about 1kg less for 14x6.
Panasport in cast is about 7.2kgs for a 15x7 and 6.4kgs for a 14x6
Superlights in a billet wheel are 6.26 for a 15x7 and 3.99kgs for a 14x6, 8.57kgs and 6.26kgs for cast respectively.
here is a good file for reference on wheel weights. this is where i got my data.
of course manufacturers often dont advertise their weights so im sure that places like panasport will make you a wheel from a billet that will be lighter than their advertised cast type roady wheels.