In reply to alps_p:
Before you jump on the big N faces, I guess the natural progression is some of the abseil-descended goulottes. Stuff like the already mentioned Ravanel-Frendo (and the multiple alternatives R of it all the way along that ridge from tne Aig Carree back towards the Grand Montets station), Petit Viking, Charlet Route on Mt Dolent, Gabarrou-Albinoni, and NW Gully of Frebouze.
But, they are longer and/or harder than Chere Couloir.
And February can be very cold in the high mountains. (technical climbing below -15C in the shade is no fun at all IMHO. I prefer late March or April.)
And there is the likelihood of deep snow with all the ski-only access, avalanche risk, etc. issues.
Personally, at that time of year, you can have more enjoyment doing some of the long icefalls in places like Cogne (e.g. Cold Couloir) or Ecrins (e.g. Freissineires has plenty of 300m+ routes). Develop your ice climbing skills. Being able to climb WI5 is a pretty valuable skill to possess on any alpine ice route, since you'll go faster and not get so easily halted by tricky impasses.
I'll not get into the vagaries of traditional alpine grades, but it is part of the reason why you can't find what you are looking for.
Hope useful.