Why search for such a faint constellation? Only because it's beautiful. Plus seeing Eridanus can give you a kinship with stargazers from centuries ago.
Orion the Hunter may be the most recognizable constellation, visible from both hemispheres. It's best in winter from the north and summer from the south.
Fornax the Furnace appears as a few dim stars to the unaided eye but harbors galaxies from one orbiting the Milky Way to some at the edge of the universe.
Cetus the Whale is a huge constellation that swims in a sea of stars near constellations named for a river and fish. It contains a wonderful variable star.
The constellation Cepheus the King is visible from the Northern Hemisphere every night of the year due to its close location to Polaris, the North Star.
Tucana the Toucan is a constellation in the Southern Hemisphere that's a cinch to spot. Just look for our little satellite galaxy, the Small Magellanic Cloud.