In reply to MartinN:
It is also possible to climb the NE Ridge by traversing in from the normal route up the Barre/Dome de Neige ie. bypassing the Barre Noire Couloir.
The Ecrins Refuge is normally very busy in summer with groups doing the Dome de Neige so getting in might be a problem; if so there are bivvy sites in the rocks below the refuge.
Assuming you have the AC guidebook then,
From Ailefroide: Normal route up the Montagne des Agneaux - not too long, mix of glacier and rock with perhaps a short abseil in descent, good views.
Pointe des Cineastes (up the S Ridge and down the NE Ridge) - good rock.
From La Berarde: Pic Coolidge (S Ridge),
Tete De Rouget (Voie des Plaques, descent by N ridge) - from Dibona refuge but avoiding the crowds on the Aig. Dibona.
I would not recommend Mont Gioberney.