Employee laptop hardware.
Minimum of 2 classes of laptop hardware will exist in every company.
1: The general purpose business class laptop.
2: The executive level business class ultra light laptop.
Always have replacement and or loaner hardware in stock. Keeping hardware in stock will help your support staff quickly and efficiently setup new employees with hardware or replace existing employees broken hardware.
In my opinion Dell and Lenovo are the best companies to standardize on. From experience they both offer easy to use repair services and no questions asked accidental damage repair. They also are the two companies that will negotiate prices or at least offer deals with businesses in the range of 500+ units.