I wanted metal over wood for my cabinets. Really a personal preference and harder to work with. But here is my logic-
1) Cool factor
2) Look good in my office
3) Contain internal fires better

I chose two of these cabinets in white. they are Sandusky Elite. they have 3 pont locking handels(recessed), heavier guage steel, and measure 78x36x24.

Sandusky Large-Capacity Storage Cabinet, 78"H x 36"W x 24"D, Putty at Staples®