As others have mentioned bump skiing and pow skiing require opposing things in a ski. Thus no ski will be able to slay both. It is a compromise. This is the reason some of us have pretty big quivers and some folks even take a second pair of skis to the mountain to switch to in the afternoon...
My first question is what kind of bump skier are you? Do you ski the "zipper line" at full tilt? Or just bounce around between lines and ski them a little more leisurely. I ask because I have seen many folks do pretty well on more dedicated pow skis such as CRJs, JJs, and HellBents... To be honest my CRJ's are pretty manageable until things get real tight. When I say tight I'm referring to lines like the Olympic line at deer valley, or the line that wasatch freestyle puts at snowbird in the spring (sorry for the Utah biased references)... Skiing those type of my lines it is almost impossible to stay in control with my CRJs. (In some sick way it is fun though). If the bumps are loose like at most resorts, I have no issue getting my CRJs around, it just may be a little more work.
With all that being said, there are some skis that perform pretty well in both conditions. These type of skis are marketed as "park/pow" skis. Basically you want a ski around 95 waist, not super stiff, and a little bit of tip and tail rocker. Some examples are the Rossi S3 and the ON3P Jmo. I have skied both in both conditions and love both of them. I own the Jmos. The Jmos have turned into my "it snowed less then 8 inches and I have no idea what conditions will be like." If you are a reasonable bump skier these type of skis should not hold you back. Also if you are a reasonable POW skier, these skies should not hold you back either.... Like before, these hybrids won't rip a bump line like my little old hart f17s nor will you be able flow the powder as easy as some CRJ's, but I guarantee these hybrids will leave a smile on your face in both conditions and if your buddies leave you in the dust, it won't be the skis fault...
Hope that helps. There a lot more skis in the "95ish waist and rocker category", since the "park/pow ski" is all the rage now. I'm sure folks will ring in with their favorites... Here is a list of skis I would consider in this area (the bigger the waist the better the pow performance, but you give up a little bump performance)
K2 Kung Fujas
Line Chronic Cryptonite
Surface Double time
Surface Watch Life