commercial laptop all expensive because not designed to kaput tomorrow.....
consumer laptops, even expensive gaming laptops show their age in 2 years.....
even though spec high, you'll start to see things like plastic crack, hinge too stiff, USB macam longar etc

Also, Elitebook 850 at 10k sounds like yesteryear prices.......
also, i think u lie a bit
maybe cost RM 6k only

Probook >Elitebook > Zbook.

Probook is cheapest, Elitebook typically does not come with workstation graphics.

Probook = E series
Elitebook = T,X series
Zbook = W series.