I've been supporting people that do REVIT and ACAD for awhile now.
What i found out is the most import things are i7, as much memory as you can have (revit eats up a ton of memory), ssd or hybrid drive, and a workstation graphics card, Nvidia Quadro, make sure its nvidia and not AMD.
If your looking for a laptop you will be choosing from the workstation class of laptop
something like this
ThinkPad W530 Portable Workstation | Lenovo (CA)