cherry picker

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A person or machine that picks cherries.
• noun A maneuverable vertical boom with an open bucket or cage at the end from which a worker can perform aerial work such as pruning trees or repairing electrical lines.
• noun A vehicle equipped with such a boom.
• noun A person who cherry-picks.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A piece of equipment consisting of a large basket at the end of an extensible boom, often mounted on a truck body, and used by workers to reach inaccessible places such as power lines and tall trees.
• noun A person or group that picks the best for themselves.