From what I understand, bumps skis can range from stiff to soft. If you're new to bumps, you shuld look at the softer skis.
The news one in the market are rossignol mogul and k2 mamba for the soft skis. Volkl dragon slayer, head tri max tend to be stiffer. IDone (japanese company) has moguls skis with different stiffness. Not sure what the new Elan (bloodline) moguls ski is like.
One year old or more models; rossignol mogul, k2 cabrawlers (same as mamba, just renamed), dynastar twister and salamon 1080 moguls. Some of us are still in mourning that that dynastar has discontinue the twister
. Overall best bet is to check out ebay and search "mogul ski" to look for sweet deals.
Also, be on the lookout for bindings; Look px12 or rossi scratch, same binding just different cosmetics. Make sure they are the flat mounts, each has models w/ built in lifters or a rubber cushion for jib/park skiers, maybe the later is ok if you can get a good deal since the cushion isn't that high and it might save some ankle/foot pain while bumping.