Putting aside the "a good skier can ski any ski in the bumps" argument and ignoring zipper line competitive style bump skiing there is a class of ski that will allow the average experienced skier to negotiate bumps more comfortably. Most people ski bumps with a more rounded turn style and attempt to slither smoothly through the turns rather than do quick rebounds off the sides of bumps in the zipper line like the competitive bumpers do. If this is the style of bump skiing you do then I have the following suggestions. First avoid race skis, cross type skis (atomic sx11 for instance), short radius carvers, extremely wide powder skis,and competive type bump skis. That leaves the general class of all mountian recreational skis. In this class avoid the stiffer ones. Skis like the K2 Apache Recon, Dynastar 8000, Nordica Hotrod Nitrous, etc make great bump skis and perform well in trees and groomers. If you don't ski every week then try something a little more forgiving like the K2 Apache X or Dynastar 4800, etc. Some people also like park skis like the Salomon 1080 or Dynastar Troublemakers for the bumps but they may not be as versatile out of the bumps. I personally ski the Dynastar 8000 as my primary bump ski at Mary Jane. I can even hold a zipper line with them when my knees are feeling good. In general for bumps I like a lighter ski that will skid easily but will set an edge quickly when needed and is not to stiff.