The cheapest IVECO is a good starter. It'll drive you mad hauling 20 tons uphill at 15 km/h, but it's <100k and you can pass it on to other drivers later.

If you want one truck to drive forever, go with the Volvo classic. It can be upgraded to do any job and has a very good engine.

Buy all other trucks and go 999 km in each make (MAN, SCANIA, DAF, Mercedes, IVECO) and then settle for the Volvo FH classic. It's what I did and the other trucks are then passed on to your employees.

And the good thing is, when you jave that achievement, then you know, which truck you actually like most and you can change your mind at any time.